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136-542: The idea is first encountered in two of Aristotle's works. A passage in De Anima , Book III explains "how the human intellect passes from its original state, in which it does not think, to a subsequent state, in which it does." He inferred that the energeia / dynamis distinction must also exist in the soul itself. Aristotle distinguished two separable types of intellect or nous which he believed were both necessary in order to explain human thinking. What modern scholars call

272-517: A will in which he asked to be buried next to his wife. Aristotle left his works to Theophrastus, his successor as the head of the Lyceum, who in turn passed them down to Neleus of Scepsis in Asia Minor. There, the papers remained hidden for protection until they were purchased by the collector Apellicon . In the meantime, many copies of Aristotle's major works had already begun to circulate and be used in

408-541: A "survival of the fittest" origin of living things and their organs, and ridiculed the idea that accidents could lead to orderly results. To put his views into modern terms, he nowhere says that different species can have a common ancestor , or that one kind can change into another , or that kinds can become extinct . Aristotle did not do experiments in the modern sense. He used the ancient Greek term pepeiramenoi to mean observations, or at most investigative procedures like dissection. In Generation of Animals , he finds

544-559: A broad range of subjects spanning the natural sciences , philosophy , linguistics , economics , politics , psychology , and the arts . As the founder of the Peripatetic school of philosophy in the Lyceum in Athens , he began the wider Aristotelian tradition that followed, which set the groundwork for the development of modern science . Little is known about Aristotle's life. He was born in

680-495: A building known as the Lyceum (named after the sacred grove of Apollo Lykeios ), in which he established his own school. The building included a gymnasium and a colonnade ( peripatos ), from which the school acquired the name Peripatetic . Aristotle conducted courses and research at the school for the next twelve years. He often lectured small groups of distinguished students and, along with some of them, such as Theophrastus , Eudemus , and Aristoxenus , Aristotle built

816-486: A darkness of the mind in mystic contemplation of the God who cannot be comprehended. Gregory was one of the earlier proponents of Christian universalism . Gregory argues that when Paul says that God will be "all in all" (1 Cor. 15:28), this means that though some may need to undergo a long period of purification, eventually "no being will remain outside the number of the saved" and that "no being created by God will fall outside

952-438: A fertilized hen's egg of a suitable stage and opens it to see the embryo's heart beating inside. Instead, he practiced a different style of science: systematically gathering data, discovering patterns common to whole groups of animals, and inferring possible causal explanations from these. This style is common in modern biology when large amounts of data become available in a new field, such as genomics . It does not result in

1088-569: A few salient points. Aristotle was born in 384 BC in Stagira , Chalcidice , about 55 km (34 miles) east of modern-day Thessaloniki . He was the son of Nicomachus , the personal physician of King Amyntas of Macedon , and Phaestis, a woman with origins from Chalcis , Euboea . Nicomachus was said to have belonged to the medical guild of Asclepiadae and was likely responsible for Aristotle's early interest in biology and medicine. Ancient tradition held that Aristotle's family descended from

1224-497: A fluid such as air. In this system, heavy bodies in steady fall indeed travel faster than light ones (whether friction is ignored, or not ), and they do fall more slowly in a denser medium. Newton's "forced" motion corresponds to Aristotle's "violent" motion with its external agent, but Aristotle's assumption that the agent's effect stops immediately it stops acting (e.g., the ball leaves the thrower's hand) has awkward consequences: he has to suppose that surrounding fluid helps to push

1360-406: A form of an apple. In this distinction, there is a particular apple and a universal form of an apple. Moreover, one can place an apple next to a book, so that one can speak of both the book and apple as being next to each other. Plato argued that there are some universal forms that are not a part of particular things. For example, it is possible that there is no particular good in existence, but "good"

1496-550: A large library which included manuscripts, maps, and museum objects. While in Athens, his wife Pythias died and Aristotle became involved with Herpyllis of Stagira. They had a son whom Aristotle named after his father, Nicomachus . This period in Athens, between 335 and 323 BC, is when Aristotle is believed to have composed many of his philosophical works. He wrote many dialogues, of which only fragments have survived. Those works that have survived are in treatise form and were not, for

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1632-597: A linear scale, and noted various exceptions, such as that sharks had a placenta like the tetrapods. To a modern biologist, the explanation, not available to Aristotle, is convergent evolution . Philosophers of science have generally concluded that Aristotle was not interested in taxonomy, but zoologists who studied this question in the early 21st century think otherwise. He believed that purposive final causes guided all natural processes; this teleological view justified his observed data as an expression of formal design. Aristotle's psychology , given in his treatise On

1768-555: A mainframe computer ( Kraemer 2003 ). This mainframe is the Agent Intellect, the "mind" of the universe, which makes all other cognition possible. Al-Farabi and Avicenna and Maimonides , agreed with the "external" interpretation of active intellect, and held that the active intellect was the lowest of the ten emanations descending through the celestial spheres . Maimonides cited it in his definition of prophecy where: Prophecy is, in truth and reality, an emanation sent forth by

1904-427: A plant in the soil is potentially ( dynamei ) a plant, and if it is not prevented by something, it will become a plant. Potentially, beings can either 'act' ( poiein ) or 'be acted upon' ( paschein ), which can be either innate or learned. For example, the eyes possess the potentiality of sight (innate – being acted upon), while the capability of playing the flute can be possessed by learning (exercise – acting). Actuality

2040-498: A priori principles. Aristotle's "natural philosophy" spans a wide range of natural phenomena including those now covered by physics, biology and other natural sciences. In Aristotle's terminology, "natural philosophy" is a branch of philosophy examining the phenomena of the natural world, and includes fields that would be regarded today as physics, biology and other natural sciences. Aristotle's work encompassed virtually all facets of intellectual inquiry. Aristotle makes philosophy in

2176-448: A reflection of Christ. Gregory, in stark contrast to most thinkers of his age, saw great beauty in the Fall : from Adam's sin from two perfect humans would eventually arise myriad. Gregory was the first voice in the ancient world known to write against all forms of slavery, declaring the institution inherently sinful. If [man] is in the likeness of God, ... who is his buyer, tell me? Who

2312-543: A reputation as an unconventional thinker whose thought arguably prefigures postmodernism . Major figures in contemporary research include Sarah Coakley , John Zizioulas and Robert Jenson. In 2003, theologian David Bentley Hart published a book seemingly influenced by Gregory. In 787 AD, the Second Council of Nicea , the seventh Ecumenical Council of the Church , honored Gregory of Nyssa: Let us then, consider who were

2448-562: A researcher and lecturer, earning for himself the nickname "mind of the school" by his tutor Plato . In Athens, he probably experienced the Eleusinian Mysteries as he wrote when describing the sights one viewed at the Mysteries, "to experience is to learn" ( παθεĩν μαθεĩν ). Aristotle remained in Athens for nearly twenty years before leaving in 348/47 BC after Plato's death. The traditional story about his departure records that he

2584-568: A revival of the study and translation of Greek patristic works. Against this background, some of Gregory of Nyssa’s works which remained unknown to the West during the medieval centuries received their first Latin translations by leading representatives of Italian and Byzantine culture." These include the early Renaissance translations of De vita Moysis by George of Trebizond in 1446, of De vita Macrinae and De anima et resurrectione by Pietro Balbi between 1465 and 1473, and of De oratione dominica by

2720-625: A significant impact across the world, and remain a subject of contemporary philosophical discussion. Aristotle's views profoundly shaped medieval scholarship . The influence of his physical science extended from late antiquity and the Early Middle Ages into the Renaissance , and was not replaced systematically until the Enlightenment and theories such as classical mechanics were developed. He influenced Judeo-Islamic philosophies during

2856-471: A stay of several months, a substitute was found—possibly Gregory's brother Peter, who was bishop of Sebaste from 381—and Gregory returned home to Nyssa to write books I and II of Against Eunomius . Gregory participated in the First Council of Constantinople (381), and perhaps gave there his famous sermon In suam ordinationem . He was chosen to eulogise at the funeral of Meletius, which occurred during

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2992-549: A thrown stone, in the Physics (254b10), and "natural motion", such as of a falling object, in On the Heavens (300a20). In violent motion, as soon as the agent stops causing it, the motion stops also: in other words, the natural state of an object is to be at rest, since Aristotle does not address friction . With this understanding, it can be observed that, as Aristotle stated, heavy objects (on

3128-467: A time receiving, or partaking of, this energeia of the nous (active intellect). Sachs comments that the nature of the active intellect was "the source of a massive amount of commentary and of fierce disagreement"; elsewhere, chapter 5 of De Anima has been referred to as "the most intensely studied sentences in the history of philosophy." As Davidson remarks: Just what Aristotle meant by potential intellect and active intellect – terms not even explicit in

3264-454: Is a historical accident: his works on botany have been lost, but two books on plants by his pupil Theophrastus have survived. Aristotle reports on the sea-life visible from observation on Lesbos and the catches of fishermen. He describes the catfish , electric ray , and frogfish in detail, as well as cephalopods such as the octopus and paper nautilus . His description of the hectocotyl arm of cephalopods, used in sexual reproduction,

3400-419: Is also a final cause or end. Then Aristotle proceeds and concludes that the actuality is prior to potentiality in formula, in time and in substantiality. With this definition of the particular substance (i.e., matter and form), Aristotle tries to solve the problem of the unity of the beings, for example, "what is it that makes a man one"? Since, according to Plato there are two Ideas: animal and biped, how then

3536-534: Is controversial, however, and other commentators suggest that Theosebia the Deaconess was one of Gregory's sisters. In 371, the Emperor Valens split Cappadocia into two new provinces, Cappadocia Prima and Cappadocia Secunda. This resulted in complex changes in ecclesiastical boundaries, during which several new bishoprics were created. Gregory was elected bishop of the new see of Nyssa in 372, presumably with

3672-427: Is his seller? To God alone belongs this power; or rather, not even to God himself. [...] God would not therefore reduce the human race to slavery, since [God] himself, when we had been enslaved to sin, spontaneously recalled us to freedom. But if God does not enslave what is free, who is he that sets his own power above God's? Gregory used Plato's definition of virtue as ‘something that admits of no master [ἀδέσποτον]’ in

3808-541: Is man a unity? However, according to Aristotle, the potential being (matter) and the actual one (form) are one and the same. Aristotle's immanent realism means his epistemology is based on the study of things that exist or happen in the world, and rises to knowledge of the universal, whereas for Plato epistemology begins with knowledge of universal Forms (or ideas) and descends to knowledge of particular imitations of these. Aristotle uses induction from examples alongside deduction , whereas Plato relies on deduction from

3944-547: Is no further reference to Cappadocia in the rest of the New Testament . Early Christianity arose in Cappadocia relatively late, with no evidence of a Christian community before the late second century AD. Alexander of Jerusalem was the first bishop of the province in the early to mid third century, a period in which Christians suffered persecution from the local Roman authorities. The community remained very small throughout

4080-525: Is observed on 10 January. The Lutheran Church–Missouri Synod commemorates Gregory along with the other Cappadocian Fathers on 10 January. Gregory is remembered (with Macrina ) in the Church of England with a lesser festival on 19 July. Gregory is revered as a saint. However, unlike the other Cappadocian fathers, he is not a Doctor of the Church . He is venerated chiefly in the East. His relics were held by

4216-569: Is often due to the lack of systematic structure and the presence of terminological inconsistencies in Gregory's work. Gregory, following Basil, defined the Trinity as "one essence [ οὐσία ] in three persons [ ὑποστάσεις ]", the formula adopted by the Council of Constantinople in 381. Like the other Cappadocian Fathers, he was a homoousian , and Against Eunomius affirms the truth of the consubstantiality of

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4352-406: Is predicated. So, according to Aristotle, the form of apple exists within each apple, rather than in the world of the forms. Concerning the nature of change ( kinesis ) and its causes, as he outlines in his Physics and On Generation and Corruption ( 319b–320a), he distinguishes coming-to-be ( genesis , also translated as 'generation') from: Coming-to-be is a change where the substrate of

4488-497: Is probably not in its original form, because it was most likely edited by students and later lecturers. The logical works of Aristotle were compiled into a set of six books called the Organon around 40 BC by Andronicus of Rhodes or others among his followers. The books are: The order of the books (or the teachings from which they are composed) is not certain, but this list was derived from analysis of Aristotle's writings. It goes from

4624-480: Is still a proper universal form. Aristotle disagreed with Plato on this point, arguing that all universals are instantiated at some period of time, and that there are no universals that are unattached to existing things. In addition, Aristotle disagreed with Plato about the location of universals. Where Plato spoke of the forms as existing separately from the things that participate in them, Aristotle maintained that universals exist within each thing on which each universal

4760-457: Is that he was an orthodox Trinitarian theologian , who was influenced by the Neoplatonism of Plotinus and believed in universal salvation following Origen . However, as a highly original and sophisticated thinker, Gregory is difficult to classify, and many aspects of his theology are contentious among both conservative Eastern Orthodox theologians and Western academic scholarship. This

4896-527: Is the Good is also Beauty. Eastern Orthodox theologians are generally critical of the theory that Gregory was influenced by neoplatonism. For example, Metropolitan Hierotheos of Nafpaktos argues in Life After Death that Gregory opposed all philosophical (as opposed to theological) endeavour as tainted with worldliness. This view is supported by Against Eunomius , where Gregory denounces Eunomius for placing

5032-413: Is the fulfilment of the end of the potentiality. Because the end ( telos ) is the principle of every change, and potentiality exists for the sake of the end, actuality, accordingly, is the end. Referring then to the previous example, it can be said that an actuality is when a plant does one of the activities that plants do. For that for the sake of which ( to hou heneka ) a thing is, is its principle, and

5168-571: Is the passive or material intellect where human thinking and remembering happens, because these involve change. Another passage which is traditionally read together with the De Anima passage is in Metaphysics , Book XII, Ch. 7–10. Aristotle again distinguishes between the active and passive intellects, but this time he equates the active intellect with the " unmoved mover " and God . He explains that when people have real knowledge, their thinking is, for

5304-454: Is to be preferred to that which has existed in such sin. For, as to the latter, on account of the depth of the ingrained evil, the chastisement in the way of purgation will be extended into infinity". However, Ramelli renders the original Greek "εἰς ἄπειρον παρατείνεται ἡ διὰ τῆς καθάρσεως κόλασις" as "the punishment provided for the purpose of purification will tend to an indefinite duration." Additional sources are needed to interpret correctly

5440-586: Is what Gregory believed and taught is affirmed by most scholars. A minority of scholars have argued that Gregory only affirmed the universal resurrection. In the Life of Moses , Gregory writes that just as the darkness left the Egyptians after three days, perhaps redemption [ ἀποκατάστασις ] will be extended to those suffering in hell [ γέεννα ]. This salvation may not only extend to humans; following Origen , there are passages where he seems to suggest (albeit through

5576-539: The Iliad , which reportedly became one of Alexander's most prized possessions. Scholars speculate that two of Aristotle's now lost works, On kingship and On behalf of the Colonies , were composed by the philosopher for the young prince. After Philip II's assassination in 336 BC, Aristotle returned to Athens for the second and final time a year later. As a metic , Aristotle could not own property in Athens and thus rented

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5712-461: The De Anima and at best implied – and just how he understood the interaction between them remains moot. Students of the history of philosophy continue to debate Aristotle's intent, particularly the question whether he considered the active intellect to be an aspect of the human soul or an entity existing independently of man. Alexander of Aphrodisias regarded the active intellect as a power external to

5848-535: The Divine Being through the medium of the Active Intellect, in the first instance to man's rational faculty , and then to his imaginative faculty . The more strict Aristotelians, Avempace and Averroes , wrote about how one could conjoin oneself with the active intellect, thus attaining a kind of philosophical enlightenment. In Medieval and Renaissance Europe some thinkers, such as Siger of Brabant , adopted

5984-634: The Early Modern period. John Philoponus (in Late antiquity ) and Galileo (in Early modern period ) are said to have shown by experiment that Aristotle's claim that a heavier object falls faster than a lighter object is incorrect. A contrary opinion is given by Carlo Rovelli , who argues that Aristotle's physics of motion is correct within its domain of validity, that of objects in the Earth 's gravitational field immersed in

6120-474: The Great Catechism , Gregory suggests that while every human will be resurrected , salvation will only be accorded to the baptised , although he also states that others driven by their passions can be saved after being purified by fire. While he believes that there will be no more evil in the hereafter, it is arguable that this does not preclude a belief that God might justly damn sinners for eternity. Thus,

6256-515: The Great Comet of 371 BC . Aristotle was one of the first people to record any geological observations. He stated that geological change was too slow to be observed in one person's lifetime. The geologist Charles Lyell noted that Aristotle described such change, including "lakes that had dried up" and "deserts that had become watered by rivers", giving as examples the growth of the Nile delta since

6392-471: The History of Animals in a graded scale of perfection, a nonreligious version of the scala naturae , with man at the top. His system had eleven grades of animal, from highest potential to lowest, expressed in their form at birth: the highest gave live birth to hot and wet creatures, the lowest laid cold, dry mineral-like eggs. Animals came above plants , and these in turn were above minerals. He grouped what

6528-451: The Milky Way was made up of "those stars which are shaded by the earth from the sun's rays," pointing out partly correctly that if "the size of the sun is greater than that of the earth and the distance of the stars from the earth many times greater than that of the sun, then... the sun shines on all the stars and the earth screens none of them." He also wrote descriptions of comets, including

6664-508: The Physics (215a25), Aristotle effectively states a quantitative law, that the speed, v, of a falling body is proportional (say, with constant c) to its weight, W, and inversely proportional to the density, ρ, of the fluid in which it is falling:; Aristotle implies that in a vacuum the speed of fall would become infinite, and concludes from this apparent absurdity that a vacuum is not possible. Opinions have varied on whether Aristotle intended to state quantitative laws. Henri Carteron held

6800-533: The Vatican until 2000, when a portion of them were translated to the Greek Orthodox church of St. Gregory of Nyssa, San Diego , California . Professor of theology, Natalie Carnes wrote: "One reason Gregory was not taken up into the theological stream in the West is that he was little translated into Latin. John Scotus Eriugena (c. 800–c. 877) should be greatly credited for the influence Gregory did have. Not only

6936-503: The stoics never questioned the institution of slavery, which was considered an ordinary part of daily life in the ancient world; and other ancient philosophers such as Plato and Aristotle also supported slavery. Gregory of Nyssa's critique was the first and only sustained critique of the institution of slavery itself made in the ancient world. There are many similarities between Gregory's theology and neoplatonist philosophy , especially that of Plotinus . Specifically, they share

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7072-444: The " passive intellect " is material and destructible and it receives the intelligible forms of things. It is acted upon. In contrast, the active intellect is what acts upon the passive intellect. It is required to make potential knowledge into actual knowledge, in the same way that light makes potential colors into actual colors. Aristotle describes this active intellect as something separate, everlasting, unchanging, and immaterial. It

7208-513: The "extreme view" that Aristotle's concept of force was basically qualitative, but other authors reject this. Archimedes corrected Aristotle's theory that bodies move towards their natural resting places; metal boats can float if they displace enough water ; floating depends in Archimedes' scheme on the mass and volume of the object, not, as Aristotle thought, its elementary composition. Aristotle's writings on motion remained influential until

7344-543: The 6th-century Latin translation of De opificio hominis by Dionysius Exiguus was very widespread in the Medieval period, and Francisco Bastitta Harriet argues that Nyssen's conceptions of indeterminate human nature and ontological freedom were among the core influences on Renaissance anthropology, particularly on the works of Nicholas of Cusa and Giovanni Pico della Mirandola . "The renewed enthusiasm of 15th-century philosophers and humanists for classical antiquity also led to

7480-635: The Byzantine scholar Athanasius Chalkeopoulos around 1465. In part due to the scholarship of Balthasar and Jean Daniélou , by the 1950s Gregory had become the subject of much serious theological research, with a critical edition of his work published ( Gregorii Nysseni Opera ), and the founding of the International Colloquium on Gregory of Nyssa. This attention has continued to the present day. Modern studies have focused on Gregory's eschatology rather than his more dogmatic writings, and he has gained

7616-524: The Christians of Cappadocia were devout, with the veneration of the Forty Martyrs of Sebaste and Saint George being particularly significant and represented by a considerable monastic presence. There were some adherents of heretical branches of Christianity, most notably Arians, Encratites and Messalians . Gregory was born around 335, probably in or near the city of Neocaesarea , Pontus . His family

7752-562: The Elder , is also revered as a saint and his maternal grandfather was a martyr, as Gregory put it "killed by Imperial wrath" under the persecution of the Roman Emperor Maximinus II . Between the 320s to the early 340s, the family rebuilt its fortunes, with Gregory's father working in the city of Neocaesarea as an advocate and rhetorician. Gregory's temperament is said to have been quiet and meek, in contrast to his brother Basil who

7888-792: The Father, the Holy Spirit as proceeding from the Father, and the Father by his role as progenitor. However, this doctrine would seem to subordinate the Son to the Father, and the Holy Spirit to the Son. Robert Jenson suggests that Gregory implies that each member of the Godhead has an individual priority: the Son has epistemological priority , the Father has ontic priority and the Spirit has metaphysical priority . Other commentators disagree: Morwenna Ludlow , for instance, argues that epistemic priority resides primarily in

8024-504: The Great beginning in 343 BC. He established a library in the Lyceum, which helped him to produce many of his hundreds of books on papyrus scrolls . Though Aristotle wrote many treatises and dialogues for publication, only around a third of his original output has survived , none of it intended for publication. Aristotle provided a complex synthesis of the various philosophies existing prior to him. His teachings and methods of inquiry have had

8160-599: The Kingdom of God". Due to the unity of human nature in Christ "all, thanks to the union with one another, will be joined in communion with the Good, in Jesus Christ Our Lord". Christ's incarnation, death and resurrection results in "total salvation for human nature". Gregory also described God's work this way: "His [God's] end is one, and one only; it is this: when the complete whole of our race shall have been perfected from

8296-550: The Lyceum of Athens, Alexandria , and later in Rome . With the Prior Analytics , Aristotle is credited with the earliest study of formal logic, and his conception of it was the dominant form of Western logic until 19th-century advances in mathematical logic . Kant stated in the Critique of Pure Reason that with Aristotle, logic reached its completion. Most of Aristotle's work

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8432-567: The Middle Ages, as well as Christian theology , especially the Neoplatonism of the Early Church and the scholastic tradition of the Catholic Church . Aristotle was revered among medieval Muslim scholars as "The First Teacher", and among medieval Christians like Thomas Aquinas as simply "The Philosopher", while the poet Dante called him "the master of those who know". His works contain

8568-523: The Nyssen taught that due to God's infinitude, a created being can never reach an understanding of God, and thus for man in both life and the afterlife there is a constant progression [ἐπέκτασις] towards the unreachable knowledge of God, as the individual continually transcends all which has been reached before. In the Life of Moses , Gregory speaks of three stages of this spiritual growth: initial darkness of ignorance , then spiritual illumination , and finally

8704-907: The Soul ( peri psychēs ), posits three kinds of soul ("psyches"): the vegetative soul, the sensitive soul, and the rational soul. Humans have all three. The vegetative soul is concerned with growth and nourishment. The sensitive soul experiences sensations and movement. The unique part of the human, rational soul is its ability to receive forms of other things and to compare them using the nous (intellect) and logos (reason). Gregory of Nyssa Autocephaly recognized by some autocephalous Churches de jure : Autocephaly and canonicity recognized by Constantinople and 3 other autocephalous Churches: Spiritual independence recognized by Georgian Orthodox Church: Semi-Autonomous: Gregory of Nyssa , also known as Gregory Nyssen ( Ancient Greek : Γρηγόριος Νύσσης or Γρηγόριος Νυσσηνός; c. 335 – c. 394),

8840-456: The Spirit in Gregory's theology. Modern proponents of social trinitarianism often claim to have been influenced by the Cappadocians' dynamic picture of the Trinity. However, it would be fundamentally incorrect to identify Gregory as a social Trinitarian, as his theology emphasises the unity of God's will, and he clearly believes that the identities of the Trinity are the three persons, not

8976-535: The academic community, particularly involving universal salvation , which has resulted in challenges to many traditional interpretations of his theology. The Book of Acts depicts that on the Day of Pentecost there were visiting Jews who were "residents of ... Cappadocia " in attendance. In the First Epistle of Peter , written after AD 65, the author greets Christians who are "exiles scattered throughout…Cappadocia". There

9112-462: The administrative ability of his brother Basil or the contemporary influence of Gregory of Nazianzus, but he was an erudite Christian theologian who made significant contributions to the doctrine of the Trinity and the Nicene Creed . Gregory's philosophical writings were influenced by Origen . Since the mid-twentieth century, there has been a significant increase in interest in Gregory's works from

9248-545: The appropriate length of time." That we can choose either to accept or ignore this purification is confirmed by the saint's many exhortations that we freely undertake the virtuous path." Dr. Ilaria Ramelli has made the observation that for Gregory free will was compatible with universal salvation, since every person would eventually accept the good having gone through purification. Nevertheless, some interpret Gregory as conceding that Judas and similar sinners will never be completely purified when he wrote, "that which never existed

9384-412: The argument linking the active intellect to the immortality of the soul, while hastening to add that they still believed in immortality as a matter of religious faith. (See Pietro Pomponazzi ; Cesare Cremonini .) Aristotle Aristotle ( Attic Greek : Ἀριστοτέλης , romanized:  Aristotélēs ; 384–322 BC) was an Ancient Greek philosopher and polymath . His writings cover

9520-438: The ball along to make it continue to rise even though the hand is no longer acting on it, resulting in the Medieval theory of impetus . Aristotle suggested that the reason for anything coming about can be attributed to four different types of simultaneously active factors. His term aitia is traditionally translated as "cause", but it does not always refer to temporal sequence; it might be better translated as "explanation", but

9656-617: The basics, the analysis of simple terms in the Categories, the analysis of propositions and their elementary relations in On Interpretation , to the study of more complex forms, namely, syllogisms (in the Analytics ) and dialectics (in the Topics and Sophistical Refutations ). The first three treatises form the core of the logical theory stricto sensu : the grammar of the language of logic and

9792-399: The becoming is for the sake of the end; and the actuality is the end, and it is for the sake of this that the potentiality is acquired. For animals do not see in order that they may have sight, but they have sight that they may see. In summary, the matter used to make a house has potentiality to be a house and both the activity of building and the form of the final house are actualities, which

9928-574: The broad sense coextensive with reasoning, which he also would describe as "science". However, his use of the term science carries a different meaning than that covered by the term "scientific method". For Aristotle, "all science ( dianoia ) is either practical, poetical or theoretical" ( Metaphysics 1025b25). His practical science includes ethics and politics; his poetical science means the study of fine arts including poetry; his theoretical science covers physics, mathematics and metaphysics. In his On Generation and Corruption , Aristotle related each of

10064-433: The cause of earthquakes was a gas or vapor ( anathymiaseis ) that was trapped inside the earth and trying to escape, following other Greek authors Anaxagoras , Empedocles and Democritus . Aristotle also made many observations about the hydrologic cycle. For example, he made some of the earliest observations about desalination: he observed early – and correctly – that when seawater is heated, freshwater evaporates and that

10200-486: The city of Stagira in northern Greece during the Classical period . His father, Nicomachus , died when Aristotle was a child, and he was brought up by a guardian. At around eighteen years old, he joined Plato 's Academy in Athens and remained there until the age of thirty seven ( c.  347 BC ). Shortly after Plato died, Aristotle left Athens and, at the request of Philip II of Macedon , tutored his son Alexander

10336-448: The city to quell discontent. In 375, Desmothenes of Pontus convened a synod at Ancyra to try Gregory on charges of embezzlement of church funds and irregular ordination of bishops. He was arrested by imperial troops in the winter of the same year, but escaped to an unknown location. The synod of Nyssa, which was convened in the spring of 376, deposed him. However, Gregory regained his see in 378, perhaps due to an amnesty promulgated by

10472-520: The commentary on 30 May in the Acta Sanctorum , for example, initially states that they were nine, before describing Peter as the tenth child. It has been established that this confusion occurred due to the death of one son in infancy, leading to ambiguities in Gregory's own writings. Gregory's parents had suffered persecution for their faith: he writes that they "had their goods confiscated for confessing Christ." Gregory's paternal grandmother, Macrina

10608-487: The correct rules of reasoning. The Rhetoric is not conventionally included, but it states that it relies on the Topics . What is today called Aristotelian logic with its types of syllogism (methods of logical argument), Aristotle himself would have labelled "analytics". The term "logic" he reserved to mean dialectics . The word "metaphysics" appears to have been coined by the first century AD editor who assembled various small selections of Aristotle's works to create

10744-520: The council. The council sent Gregory on a mission to Arabia, perhaps to ameliorate the situation in Bostra where two men, Agapius and Badagius, claimed to be bishop. If this is the case, Gregory was unsuccessful, as the see was still contested in 394. He then travelled to Jerusalem where Cyril of Jerusalem faced opposition from local clergy due to the fact that he had been ordained by Acacius of Caesarea , an Arian heretic. Gregory's attempted mediation of

10880-399: The data to come to the theory of evolution . Aristotle's writings can seem to modern readers close to implying evolution, but while Aristotle was aware that new mutations or hybridizations could occur, he saw these as rare accidents. For Aristotle, accidents, like heat waves in winter, must be considered distinct from natural causes. He was thus critical of Empedocles's materialist theory of

11016-787: The death. Following Alexander's death, anti-Macedonian sentiment in Athens was rekindled. In 322 BC, Demophilus and Eurymedon the Hierophant reportedly denounced Aristotle for impiety, prompting him to flee to his mother's family estate in Chalcis, Euboea , at which occasion he was said to have stated "I will not allow the Athenians to sin twice against philosophy" – a reference to Athens's trial and execution of Socrates . He died in Chalcis, Euboea of natural causes later that same year, having named his student Antipater as his chief executor and leaving

11152-440: The discovery of mystical theology, or rather with the perception that darkness is an appropriate symbol under which God can be discussed. There is much truth in this....Gregory seems to have been the first Christian writer to have made this important point. J. Kameron Carter writes about Gregory's stance on slavery, in the book Race a Theological Account (2008): What interests me is the defining features of Gregory's vision of

11288-520: The dispute was unsuccessful, and he himself was accused of holding unorthodox views on the nature of Christ . His later reign in Nyssa was marked by conflict with his metropolitan, Helladius. Gregory was present at a 394 synod convened at Constantinople to discuss the continued problems in Bostra. While the year of his death is unknown, it is generally accepted that he died in 394. The traditional view of Gregory

11424-479: The earliest known formal study of logic, and were studied by medieval scholars such as Peter Abelard and Jean Buridan . Aristotle's influence on logic continued well into the 19th century. In addition, his ethics , although always influential, gained renewed interest with the modern advent of virtue ethics . In general, the details of Aristotle's life are not well-established. The biographies written in ancient times are often speculative and historians only agree on

11560-543: The end of his life, the two men became estranged having diverging opinions over issues, like the optimal administration of city-states, the treatment of conquered populations, such as the Persians, and philosophical questions, like the definition of braveness. A widespread speculation in antiquity suggested that Aristotle played a role in Alexander's death, but the only evidence of this is an unlikely claim made some six years after

11696-563: The first man to the last—some having at once in this life been cleansed from evil, others having afterwards in the necessary periods been healed by the Fire, others having in their life here been unconscious equally of good and of evil—to offer to every one of us participation in the blessings which are in Him, which, the Scripture tells us, 'eye hath not seen, nor ear heard,' nor thought ever reached." That this

11832-533: The following. Brood size decreases with (adult) body mass, so that an elephant has fewer young (usually just one) per brood than a mouse. Lifespan increases with gestation period , and also with body mass, so that elephants live longer than mice, have a longer period of gestation, and are heavier. As a final example, fecundity decreases with lifespan, so long-lived kinds like elephants have fewer young in total than short-lived kinds like mice. Aristotle distinguished about 500 species of animals , arranging these in

11968-403: The form of the substance is the actual house, namely 'covering for bodies and chattels' or any other differentia that let us define something as a house. The formula that gives the components is the account of the matter, and the formula that gives the differentia is the account of the form. Like his teacher Plato, Aristotle's philosophy aims at the universal . Aristotle's ontology places

12104-509: The four elements proposed earlier by Empedocles , earth , water , air , and fire , to two of the four sensible qualities, hot, cold, wet, and dry. In the Empedoclean scheme, all matter was made of the four elements, in differing proportions. Aristotle's scheme added the heavenly aether , the divine substance of the heavenly spheres , stars and planets. Aristotle describes two kinds of motion: "violent" or "unnatural motion", such as that of

12240-519: The fourth century, and was completed by Augustine in the fourth and fifth centuries. ...[Gregory] taught that Creation was potential. God imparted to matter its fundamental properties and laws. The objects and completed forms of the Universe developed gradually out of chaotic material. Anthony Meredith writes of Gregory's mystical and apophatic writings in his book Gregory of Nyssa (The Early Church Fathers) (1999): Gregory has often been credited with

12376-428: The ground, say) require more force to make them move; and objects pushed with greater force move faster. This would imply the equation incorrect in modern physics. Natural motion depends on the element concerned: the aether naturally moves in a circle around the heavens, while the 4 Empedoclean elements move vertically up (like fire, as is observed) or down (like earth) towards their natural resting places. In

12512-583: The human being is exceptional, being created in the image of God . Humanity is theomorphic both in having self-awareness and free will , the latter which gives each individual existential power, because to Gregory, in disregarding God one negates one's own existence. In the Song of Songs , Gregory metaphorically describes human lives as paintings created by apprentices to a master: the apprentices (the human wills) imitate their master's work (the life of Christ) with beautiful colors ( virtues ), and thus man strives to be

12648-460: The human mind, going so far as to identify it with God. The reason for positing a single external Agent Intellect is that all (rational) human beings are considered by Aristotelians to possess or have access to a fixed and stable set of concepts, a unified correct knowledge of the universe. The only way that all human minds could possess the same correct knowledge is if they all had access to some central knowledge store, as terminals might have access to

12784-404: The idea that the reality of God is completely inaccessible to human beings and that man can only come to see God through a spiritual journey in which knowledge [ γνῶσις ] is rejected in favour of meditation . Gregory does not refer to any neoplatonist philosophers in his work, and there is only one disputed passage which may directly quote Plotinus. Considering this, it seems possible that Gregory

12920-440: The image. According to Aristotle, spontaneity and chance are causes of some things, distinguishable from other types of cause such as simple necessity. Chance as an incidental cause lies in the realm of accidental things , "from what is spontaneous". There is also more a specific kind of chance, which Aristotle names "luck", that only applies to people's moral choices. In astronomy , Aristotle refuted Democritus 's claim that

13056-449: The interpretation of Averroes on every point, as did the later school of "Paduan Averroists". Thomas Aquinas elaborated on Aristotle's distinction between the active intellect and passive intellect in his Disputed Questions on the Soul and his commentary on Aristotle's De Anima , arguing, against Averroes, that the active intellect is part of the individual human personality. In his Summa Theologica , Aquinas states that "according to

13192-475: The just society: his unequivocal stance against 'the peculiar institution of slavery' and his call for the manumission of all slaves. I am interested in reading Gregory as a fourth century abolitionist intellectual....His outlook surpassed not only St. Paul's more moderate (but to be fair to Paul, in his moment, revolutionary) stance on the subject but also those of all ancient intellectuals -- Pagan, Jewish and Christian - from Aristotle to Cicero and from Augustine in

13328-558: The legendary physician Asclepius and his son Machaon . Both of Aristotle's parents died when he was still at a young age and Proxenus of Atarneus became his guardian. Although little information about Aristotle's childhood has survived, he probably spent some time in the Macedonian capital, making his first connections with the Macedonian monarchy . At the age of seventeen or eighteen, Aristotle moved to Athens to continue his education at Plato's Academy . He became distinguished as

13464-486: The limited minds of created beings. In Life of Moses , Gregory writes: "...every concept that comes from some comprehensible image, by an approximate understanding and by guessing at the Divine nature, constitutes an idol of God and does not proclaim God." Gregory's theology was thus apophatic : he proposed that God should be defined in terms of what we know He is not rather than what we might speculate Him to be. Accordingly,

13600-777: The main difference between Gregory's conception of ἀποκατάστασις and that of Origen would be that Gregory believes that mankind will be collectively returned to sinlessness, whereas Origen believes that personal salvation will be universal. This interpretation of Gregory has been criticized recently, however. After all, at the end of chapter XXXV of the Great Catechism Gregory writes that those who have not been purified by water through baptism "must needs be purified by fire" so that "after long succeeding ages, their nature may be restored pure again to God". Attempting to reconcile these disparate positions, Eastern Orthodox theologian Dr. Mario Baghos notes that "when taken at face value

13736-468: The modern zoologist would call vertebrates as the hotter "animals with blood", and below them the colder invertebrates as "animals without blood". Those with blood were divided into the live-bearing ( mammals ), and the egg-laying ( birds , reptiles , fish ). Those without blood were insects, crustacea (non-shelled – cephalopods, and shelled ) and the hard-shelled molluscs ( bivalves and gastropods ). He recognised that animals did not exactly fit into

13872-481: The most part, intended for widespread publication; they are generally thought to be lecture aids for his students. His most important treatises include Physics , Metaphysics , Nicomachean Ethics , Politics , On the Soul and Poetics . Aristotle studied and made significant contributions to "logic, metaphysics, mathematics, physics, biology, botany, ethics, politics, agriculture, medicine, dance, and theatre." While Alexander deeply admired Aristotle, near

14008-498: The near-by island of Lesbos . During this time, Aristotle married Pythias , Hermias's adoptive daughter and niece, and had a daughter whom they also named Pythias. In 343/42 BC, Aristotle was invited to Pella by Philip II of Macedon in order to become the tutor to his thirteen-year-old son Alexander ; a choice perhaps influenced by the relationship of Aristotle's family with the Macedonian dynasty. Aristotle taught Alexander at

14144-684: The new emperor, Gratian . In the same year Basil died, and despite the relative unimportance of Nyssa, Gregory took over many of his brother's former responsibilities in Pontus. He was present at the Synod of Antioch in April 379, where he unsuccessfully attempted to reconcile the followers of Meletius of Antioch with those of Paulinus . After visiting the village of Annisa to see his dying sister Macrina, he returned to Nyssa in August. In 380 he travelled to Sebaste , in

14280-404: The oceans are then replenished by the cycle of rainfall and river runoff ("I have proved by experiment that salt water evaporated forms fresh and the vapor does not when it condenses condense into sea water again.") Aristotle was the first person to study biology systematically, and biology forms a large part of his writings. He spent two years observing and describing the zoology of Lesbos and

14416-437: The primary kind of knowledge; but if there is some motionless independent thing, the knowledge of this precedes it and is first philosophy, and it is universal in just this way , because it is first. And it belongs to this sort of philosophy to study being as being, both what it is and what belongs to it just by virtue of being. Aristotle examines the concepts of substance ( ousia ) and essence ( to ti ên einai , "the what it

14552-567: The private school of Mieza , in the gardens of the Nymphs , the royal estate near Pella. Alexander's education probably included a number of subjects, such as ethics and politics , as well as standard literary texts, like Euripides and Homer . It is likely that during Aristotle's time in the Macedonian court, other prominent nobles, like Ptolemy and Cassander , would have occasionally attended his lectures. Aristotle encouraged Alexander toward eastern conquest, and his own attitude towards Persia

14688-465: The province of Armenia Prima , to support a pro-Nicene candidate for the election to the bishopric. To his surprise, he himself was elected to the seat, perhaps due to the population's association of him with his brother. However, Gregory deeply disliked the relatively unhellenized society of Armenia, and he was confronted by an investigation into his orthodoxy by local opponents of the Nicene theology. After

14824-466: The questioned chapter. Gregory's anthropology is founded on the ontological distinction between the created and uncreated. Man is a material creation, and thus limited, but infinite in that his immortal soul has an indefinite capacity to grow closer to the divine. Gregory believed that the soul is created simultaneous to the creation of the body (in opposition to Origen, who believed in preexistence ), and that embryos were thus persons. To Gregory,

14960-477: The relations between them. Gregory was one of the first theologians to argue that God is infinite . His main argument for the infinity of God, found in Against Eunomius , is that God's goodness is limitless, and as God's goodness is essential , God is also limitless. An important consequence of Gregory's belief in the infinity of God is his belief that God, as limitless, is essentially incomprehensible to

15096-472: The rest of the Apostles and prophets". While his brothers Basil and Naucratius lived as hermits from c.  355 , Gregory initially pursued a non-ecclesiastical career as a rhetorician . He did, however, act as a lector . He is known to have married a woman named Theosebia during this period, who is sometimes identified with Theosebia the Deaconess , venerated as a saint by Orthodox Christianity. This

15232-517: The results of his systematic Aristotelean philosophy above the traditional teachings of the Church. The Eastern Orthodox and Eastern Catholic Churches commemorate Gregory of Nyssa on 10 January. The Roman Martyrology and the Episcopal Church commemorate his death on 9 March. In modern Roman Catholic calendars which include the feast of St. Gregory, such as the Benedictines , his feast day

15368-621: The saint seems to be contradicting himself in these passages; on the one hand he asserted the salvation of all and the complete eradication of evil, and, on the other, that the fire needed to purge evil is 'sleepless', i.e. everlasting. The only solution to this inconsistency is to view any allusion to universal salvation in St Gregory as an expression of God's intention for humanity, which is in fact attested to when his holy sister states that God has "one goal ... some straightway even in this life purified from evil, others healed hereafter through fire for

15504-433: The same certainty as experimental science, but it sets out testable hypotheses and constructs a narrative explanation of what is observed. In this sense, Aristotle's biology is scientific. From the data he collected and documented, Aristotle inferred quite a number of rules relating the life-history features of the live-bearing tetrapods (terrestrial placental mammals) that he studied. Among these correct predictions are

15640-538: The service of his own theological arguments against slavery: (1) each human is an image of God and therefore free, (2) the equality of all humans reflects the equality of the divine Persons and (3) just as the divine nature cannot be divided into slavery (δουλεία) and mastery (δυναστεία, κυριότης), neither can human nature; the whole creation is a slave, but of God alone. Although the stoic Seneca had criticized cruel slave masters and advised slave masters to treat slaves with kindness (or at least those of good character),

15776-478: The support of his brother Basil, who was metropolitan of Caesarea . Gregory's early policies as bishop often went against those of Basil; for instance, while his brother condemned the Sabellianist followers of Marcellus of Ancyra as heretics , Gregory may have tried to reconcile them with the church. Gregory faced opposition to his reign in Nyssa and, in 373, Amphilochius , bishop of Iconium , had to visit

15912-549: The surrounding seas, including in particular the Pyrrha lagoon in the centre of Lesbos. His data in History of Animals , Generation of Animals , Movement of Animals , and Parts of Animals are assembled from his own observations, statements given by people with specialized knowledge, such as beekeepers and fishermen, and less accurate accounts provided by travellers from overseas. His apparent emphasis on animals rather than plants

16048-420: The teaching of our Faith, this separated intellect is God Himself, who is the creator of the soul and in whom alone the soul is beatified." Citing Gregory of Nyssa , he said "man has intellective understanding along with the angels" which are called 'minds' and 'intellects' because they have no other power than the intellective power and the will (Question 79, Article 1). A third school, of "Alexandrists", rejected

16184-402: The thing that has undergone the change has itself changed. In that particular change he introduces the concept of potentiality ( dynamis ) and actuality ( entelecheia ) in association with the matter and the form. Referring to potentiality, this is what a thing is capable of doing or being acted upon if the conditions are right and it is not prevented by something else. For example, the seed of

16320-573: The third century: when Gregory Thaumaturgus acceded to the bishopric in c. 250, according to his namesake, the Nyssen, there were only seventeen members of the Church in Caesarea. Cappadocian bishops were among those at the First Council of Nicaea . Because of the broad distribution of the population, rural bishops (χωρεπίσκοποι) were appointed to support the Bishop of Caesarea . During the late fourth century there were around 50 of them. In Gregory's lifetime,

16456-470: The time of Homer , and "the upheaving of one of the Aeolian islands , previous to a volcanic eruption ."' Meteorologica lends its name to the modern study of meteorology, but its modern usage diverges from the content of Aristotle's ancient treatise on meteors . The ancient Greeks did use the term for a range of atmospheric phenomena, but also for earthquakes and volcanic eruptions. Aristotle proposed that

16592-473: The traditional rendering will be employed here. Aristotle describes experiments in optics using a camera obscura in Problems , book 15. The apparatus consisted of a dark chamber with a small aperture that let light in. With it, he saw that whatever shape he made the hole, the sun's image always remained circular. He also noted that increasing the distance between the aperture and the image surface magnified

16728-401: The treatise we know by the name Metaphysics . Aristotle called it "first philosophy", and distinguished it from mathematics and natural science (physics) as the contemplative ( theoretikē ) philosophy which is "theological" and studies the divine. He wrote in his Metaphysics (1026a16): If there were no other independent things besides the composite natural ones, the study of nature would be

16864-446: The trinity over Eunomius' Aristotelian belief that the Father's substance is unengendered, whereas the Son's is engendered. According to Gregory, the differences between the three persons of the Trinity reside in their differing hypostatic origin, and the triune nature of God is revealed through divine action (despite the unity of God in His action). The Son is therefore defined as begotten of

17000-492: The universal ( katholou ) in particulars ( kath' hekaston ), things in the world, whereas for Plato the universal is a separately existing form which actual things imitate. For Aristotle, "form" is still what phenomena are based on, but is "instantiated" in a particular substance. Plato argued that all things have a universal form , which could be either a property or a relation to other things. When one looks at an apple, for example, one sees an apple, and one can also analyse

17136-522: The venerable doctors and indomitable champions of the Church [including] Gregory Primate of Nyssa, who all have called the father of fathers. Henry Fairfield Osborn wrote in his work on the history of evolutionary thought , From the Greeks to Darwin (1894): Among the Christian Fathers the movement towards a partly naturalistic interpretation of the order of Creation was made by Gregory of Nyssa in

17272-413: The voice of Macrina) that even the demons will have a place in Christ's "world of goodness". Gregory's interpretations of 1 Corinthians 15:28 ("And when all things shall be subdued unto him ...") and Philippians 2:10 ("That at the name of Jesus every knee should bow, of things in heaven, and things in earth, and things under the earth") support this understanding of his theology. Nevertheless, in

17408-508: Was Eriugena himself influenced by Gregory, but he also translated On the Making of the Human into Latin." Gregory's work received little scholarly attention in the West until the mid-twentieth century, and he was historically treated as a minor figure in comparison to Basil the Great or Gregory of Nazianzus. As late as 1942, Hans Urs von Balthasar wrote that his work was virtually unknown. However,

17544-525: Was an early Roman Christian prelate who served as Bishop of Nyssa from 372 to 376 and from 378 until his death in 394. He is venerated as a saint in Eastern Orthodoxy , Catholicism , Oriental Orthodoxy , Anglicanism , and Lutheranism . Gregory, his elder brother Basil of Caesarea , and their friend Gregory of Nazianzus are collectively known as the Cappadocian Fathers . Gregory lacked

17680-455: Was aristocratic and Christian—according to Gregory of Nazianzus , his mother was Emmelia of Caesarea , and his father, a rhetorician, has been identified either as Basil the Elder or as a Gregory. Among his eight siblings were St. Macrina the Younger , St. Naucratius , St. Peter of Sebaste and St. Basil of Caesarea . The precise number of children in the family was historically contentious:

17816-670: Was disappointed with the Academy's direction after control passed to Plato's nephew Speusippus , although it is possible that the anti-Macedonian sentiments in Athens could have also influenced his decision. Aristotle left with Xenocrates to Assos in Asia Minor , where he was invited by his former fellow student Hermias of Atarneus ; he stayed there for a few years and left around the time of Hermias' death. While at Assos, Aristotle and his colleague Theophrastus did extensive research in botany and marine biology , which they later continued at

17952-468: Was familiar with Plotinus and perhaps other figures in neoplatonism. However, some significant differences between neoplatonism and Gregory's thought exist, such as Gregory's statement that beauty and goodness are equivalent, which contrasts with Plotinus' view that they are two different qualities. However Plotinus does say " And Beauty, this Beauty which is also the Good " implying the Platonist One which

18088-569: Was known to be much more outspoken. Gregory was first educated at home, by his mother Emmelia and sister Macrina. Little is known of what further education he received. Apocryphal hagiographies depict him studying at Athens , but this is speculation probably based on the life of his brother Basil. It seems more likely that he continued his studies in Caesarea , where he read classical literature , philosophy and perhaps medicine . Gregory himself claimed that his only teachers were Basil, "Paul, John and

18224-425: Was strongly ethnocentric . In one famous example, he counsels Alexander to be "a leader to the Greeks and a despot to the barbarians". Alexander's education under the guardianship of Aristotle likely lasted for only a few years, as at around the age of sixteen he returned to Pella and was appointed regent of Macedon by his father Philip. During this time, Aristotle is said to have gifted Alexander an annotated copy of

18360-421: Was to be") in his Metaphysics (Book VII), and he concludes that a particular substance is a combination of both matter and form, a philosophical theory called hylomorphism . In Book VIII, he distinguishes the matter of the substance as the substratum , or the stuff of which it is composed. For example, the matter of a house is the bricks, stones, timbers, etc., or whatever constitutes the potential house, while

18496-588: Was widely disbelieved until the 19th century. He gives accurate descriptions of the four-chambered fore-stomachs of ruminants , and of the ovoviviparous embryological development of the hound shark . He notes that an animal's structure is well matched to function so birds like the heron (which live in marshes with soft mud and live by catching fish) have a long neck, long legs, and a sharp spear-like beak, whereas ducks that swim have short legs and webbed feet. Darwin , too, noted these sorts of differences between similar kinds of animal, but unlike Aristotle used

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