Plato: Philosophy of Science

Although a great deal has been written on Plato's ethics, his cosmology has not received so much attention in recent times and its importance for his ethical thought has remained underexplored. By offering accounts of Timaeus, Philebus, Politicus and Laws X, the book reveals a strongly symbiotic relation between the cosmic and human sphere. It is argued that in his late period Plato presents a picture of an organic universe, endowed with structure and intrinsic value, which both urges our respect (...) and calls for our responsible intervention. Humans are thus seen as citizens of a university that can provide a context for their flourishing even in the absence of good political institutions. The book sheds light on many intricate metaphysical issues in late Plato and brings out the close connections between his cosmology and the development of his ethics. (shrink)

How was the world generated and how does matter continue to be ordered so that the world can continue functioning? Questions like these have existed as long as humanity has been capable of rational thought. In antiquity, Plato's Timaeus introduced the concept of the Demiurge, or Craftsman-god, to answer them. This lucid and wide-ranging book argues that the concept of the Demiurge was highly influential on the many discussions operating in Middle Platonist, Gnostic, Hermetic and Christian contexts in the first (...) three centuries AD. It explores key metaphysical problems such as the origin of evil, the relationship between matter and the First Principle and the deployment of ever-increasing numbers of secondary deities to insulate the First Principle from the sensible world. It also focuses on the decreasing importance of demiurgy in Neoplatonism, with its postulation of procession and return. (shrink)

Plato’s Timaeus was his only cosmological dialogue and for almost thirteen hundred years it provided the basis in the West for educated people’s general view of the natural world. The author provides a translation of this important work, together with the Critias – the source of the legendary tale of Atlantis. He has taken particular care to provide an accurate rendering of Plato’s words and to avoid putting his own or any other interpretation on the works.

Ian Crombie’s impressive volumes provide a comprehensive interpretation of Plato’s doctrines. Volume 2 deals with more technical philosophical topics, including the theory of knowledge, philosophy of nature, and the methodology of science and philosophy. Each volume is self-contained.

Plato’s Timaeus–Critias juxtaposes a long description of our universe in the making with a discourse on human nature. The latter, confined to Critias, flanks Timaeus’ full-blown cosmogony without clearly articulating how, if at all, do the apparently so different stories fit together. By contrast to many precedent efforts at articulating their relation, the article tries to take seriously Timaeus’ distinction between the two kinds of divinities, whereby he opposes celestial bodies together with the ensouled physical universe to the traditional gods. (...) It seems possible that the two kinds of gods correspond to the duality of human nature itself, and thus to its peculiar position at the juncture of the immortal and mortal parts of the universe. Plato’s recourse to gods distinct from the celestial objects of intellectual assimilation then has nothing to do with theology in some doctrinal sense, but serves to indicate a link between divine and human capacities of deliberation and practical action. Reread in this light, the story told by Critias and several passages from the speech of Timaeus indicate the limits of theoretical knowledge and point towards the problematic ontology of the deliberating mind and the puzzling status of artefacts including man and the universe.In this context, the article re-examines the issue of human civilization and war, and also the question of great cataclysms. Presented by Critias, these issues are revelatory of the Platonic conception of human city not as an expression of man’s natural gregariousness but as a carefully composed artefact. The article concludes that, under the overlays of pseudo-history and cosmology, Socratic colours may well be more prominent than we usually assume. (shrink)

What does Socrates mean by suggesting that no one can understand the nature of the soul "without the nature of the whole" (Phaedrus 270c)? I raise epistemological and metaphysical questions for Mary Louise Gill's proposal that he means us to consider the whole environment, and I make a case for the old-fashioned interpretation that he means us to consider the whole cosmos.

From antiquity on, the status of Critias' account has been the subject of intense debate. Is the Atlantis story 'real history'? The dialogue invites us to raise this question but also to reflect on its terms. In this paper I shall argue that the story should be seen as 'history' only in a special Platonic sense: it is a story which is fabricated about the past in order to reflect a general truth about how ideal citizens would behave in action.

In one of the most disputed passages of Greek literature Plato in the Republic, 7. 528e–530c prescribes astronomy as the fourth study in the education of the Guardians. But what sort of astronomy? According to one school of thought it is a purely speculative study of bodies in motion having no relation to the celestial objects that we see. While this interpretation has rejoiced the hearts of Plato's detractors, who regard him as an obstacle to the progress of science, it (...) has dismayed his admirers. Another school of thought holds that what Plato meant was that astronomers must get to know the real motions of the heavenly bodies as opposed to their apparent motions as seen by us on earth. The opposed interpretations may be set out in the following representative citations from Sir Thomas Heath and John Burnet. (shrink)

Plato's comments on astronomy and the education of the guardians at Republic 528e ff have been hotly disputed, and have provoked much criticism from those who have interpreted them as a rejection or denigration of observational astronomy. Here I argue that the key to interpreting these comments lies in the relationship between the conception of enquiry that is implicit in the epistemological allegories, and the programme for the education of the guardians that Plato subsequently proposes. We have, I suggest, been (...) too eager to stress the similarities here, when recognition of the differences may supply us with the tools required for a better understanding of 528e ff, one that to a large extent disarms the anti-empirical critique. My discussion proceeds in three stages. Firstly, Plato takes great care to place his comments on astronomy in the context of the preceding epistemological allegories. Is there any evidence here, where Plato might be thought to discuss enquiry in general, that he rejected or denigrated observation? I argue that even if Plato advocated a 'Two Worlds' (TW) ontology, he still envisaged a dynamic process of enquiry, interrelating sensibles and intelligibles, the investigation of each being necessary but not sufficient to achieve the overall aim. Secondly, Plato appears to be deriving how we ought to go about educating the guardians from how we ought to conduct our enquiries. While the two are intimately related there are important differences, recognition of which turns the supposed rejection of observation into an affirmation of the need for an initial empirical approach. I contend that this makes good sense of the internal structure of 528e ff, and of its relations to other parts of the Republic. Thirdly, I discuss the Republic in relation to the evidence offered by later works on the question of astronomy and observation, and raise the question of whether Plato's views on the imperfection of the sensible world necessarily lead to the denigration of careful and prolonged empirical work. (shrink)

Plato’s demiurge makes a series of questionable decisions in creating the world. Most notoriously, he endeavors to replicate, to the extent possible, some of the features that his model possesses just insofar as it is a Form. This has provoked the colorful complaint that the demiurge is as raving mad as a general contractor who constructs a house of vellum to better realize the architect’s vellum plans (Keyt 1971). The present paper considers the sanity of the demiurge’s reasoning in light (...) of Timaeus 32c5-33b1, where he invokes considerations of wholeness, completeness, uniqueness, and eternality in deciding to build the body of the world from all of each of the simple bodies. Since the passage makes no appeal to the demiurge’s intelligible model, one can mine it for indications of the value that the demiurge takes those features to have independent of mimetic goals. I argue that, for Plato, those features are intrinsically good-making and, thus, that it is not only appropriate for them to characterize Forms qua Forms but also that it is appropriate for the demiurge to aim at replicating them, to the extent possible, in his creation. In particular, I argue that the demiurge’s success in instilling a circumscribed version of each feature in his creation helps to qualify it as a genuine being despite the fact that it comes to be. (shrink)

The intellectual history of evolutionary theory really does not begin in earnest until the late seventeenth/early eighteenth century. Prior to that, the idea that species might have evolved over time was not a serious possibility for most naturalists and philosophers. There is certainly no substantive debate in antiquity about evolution in the modern sense. There were really only two competing explanations for how living things came to have the parts they do: design or blind chance. Ancient Greek Atomism, for example, (...) taught that all composite bodies, including living things, are generated through the random collision of atoms as they rebel and move in the void. Plato and Aristotle both dismissed this possibility on the grounds that living things are too complex and too well-adapted to be products of chance. This eventually became the central premise in Galen’s own Argument from Design. That species forms might have gradually evolved over time by a process of natural selection was not seen as a plausible alternative. Of course, such a theory had been proposed by Empedocles in the fifth century BCE. But because his theory still relied heavily on chance, it was not taken seriously by any of the later ancient Greek or Roman thinkers. My aim in this paper is to investigate the reasons why evolutionary thinking failed to gain momentum in antiquity after its introduction by Empedocles. (shrink)

This paper is an investigation of the place of rhetoric in Plato's judgement that philosophers must rule. The possibility that rhetoric could facilitate the rule of philosophy raises the question of whether rhetoric could also be used to undermine the governance of philosophy. It is my thesis that Plato argues for understanding rhetoric as limited in its ability to function at cross-purposes to those of philosophy because of a basic and direct relationship between the effectiveness of rhetoric and its ability (...) to promote the ends of its audience. In the Phaedrus, we are told that persuasion requires rhetors to comprehend the nature of their audience so that appropriate methods of persuasion may be employed. This dependence on the nature of its subject is extended to include that subject's ends, an understanding of which is the province of philosophy. Since philosophy as it is put forward in the dialogues is interested in determining and promoting proper human fulfilment, then ultimately constraining the effectiveness of rhetoric in terms of the nature of its object ties rhetoric to the philosophic agenda. (shrink)

In this paper I examine the role of optimality reasoning in Aristotle’s natural science. By “optimality reasoning” I mean reasoning that appeals to some conception of “what is best” in order to explain why things are the way they are. We are first introduced to this pattern of reasoning in the famous passage at Phaedo 97b8-98a2, where (Plato’s) Socrates invokes “what is best” as a cause (aitia) of things in nature. This passage can be seen as the intellectual ancestor of (...) Aristotle’s own principle, expressed by the famous dictum “nature does nothing in vain but always what is best for the substance from among the possibilities concerning each kind of animal” (Progression of Animals II, 704b12-18). The paper is focused around exploring three questions that arise in connection with Aristotle’s use of this optimality principle: (1) How do we understand the concept of “the best” at work in the principle? (2) How does Aristotle conceive of “the range of possibilities”? And, finally, (3) what role does optimality reasoning play in Aristotle’s natural science? Is it a special form of demonstration in which the optimality principle functions as one of its premises, or is it a heuristic device that helps uncover those causally relevant features of a natural substances that ultimately serve as middle terms in demonstrations? In the final section I return to the comparison between Plato and Aristotle and argue that, while both see the natural world as the product of an optimizing agent and while both see this assumption as licensing a pattern of reasoning that appeals to a certain conception of “the best”, they disagree fundamentally over what the optimization agent is and how it operates. Thus, despite their general agreement, it would be a mistake to think that Aristotle simply took over Plato’s use of optimality reasoning without significant modifications. (shrink)

In the creation myth of the Timaeus Plato describes God as wishing that all things should be good so far as is possible. Wherefore, finding the whole visible sphere of the world not at rest, but moving in an irregular fashion, out of disorder He brought order, thinking that this was in every way an improvement. To achieve His end He placed intelligence in soul and soul in body, reflecting that nothing unintelligent could ever be better than something intelligent . (...) From this account of creation it would seem that God confronted a chaotic world whose disorderly motions existed in full independence of the principle of soul. Yet, in his doctrinal pronouncements in the Laws and the Pbaedrus on the origin of motion, Plato declares soul to be elder born than bodies and the prime source of all their changes and transformations. (shrink)

In this paper, I set out to refute several charges that have recently been raised against Plato’s attitude toward the environment and to present him under a new light of relevance for the contemporary environmental debate. For this purpose, I assess the meaning of Plato’s metaphysical dualism, his notion of nature and teleology, and the kind of value that he attributes to animals, plants, and the land in general. I thus show how Plato’s organicist view of the universe endows it (...) with an intrinsic value that is over and above each of its parts, including humans, and provides an argument for the preservation of species of nonhuman animals, which in many relevant ways are not ranked below the human species. In addition, I show how Plato’s dialogues provide good evidence for human concern about the environment and how such a concern is promoted rather than hindered by his nonanthropocentric notion of teleology. (shrink)

What is the Timaeus-Critias about? -- The status of the Atlantis story -- The status of Timaeus' account -- Teleology and craftsmanship -- Necessity an teleology -- Space and motion -- Body, soul, and tripartition -- Perception and cosmology -- Dialogue and dialectic.

Plato's Timaeus is one of the most influential and challenging works of ancient philosophy to have come down to us. Sarah Broadie's rich and compelling study proposes new interpretations of major elements of the Timaeus, including the separate Demiurge, the cosmic 'beginning', the 'second mixing', the Receptacle and the Atlantis story. Broadie shows how Plato deploys the mythic themes of the Timaeus to convey fundamental philosophical insights and examines the profoundly differing methods of interpretation which have been brought to bear (...) on the work. Her book is for everyone interested in Ancient Greek philosophy, cosmology and mythology, whether classicists, philosophers, historians of ideas or historians of science. It offers new findings to scholars familiar with the material, but it is also a clear and reliable resource for anyone coming to it for the first time. (shrink)

This article explores how Plato, in his “metaphysical” dialogues, sees the specific properties of motion , which lend themselves to adaptation for the purposes of maintaining or restoring the health of the soul. Plato explores the property of regular or rhythmic motion in particular. The attention has been drawn to the analogy between the calming effect of music, at the human level, and the Demiurge’s achievement in willing the world into existence. The focus of the article lays on the Laws, (...) in which the principle of musical motion plays a central role in resolution of the contradictions between material and spiritual, natural and physiological, medical and educative.U članku se istražuje kako Platon u svojim “metafizičkim” dijalozima vidi specifična svojstava kretanja koja su prikladna za prilagodbu u svrhu očuvanja ili uspostavljanja zdravlja duše. Platon posebno istražuje svojstvo pravilnog ili ritmičkog kretanja. Naglašava se analogija između umirujućeg učinka glazbe, na ljudskoj razini, i Demiurgova stvaranja svijeta. U žarištu članka su Zakoni u kojima načelo glazbenog kretanja igra ključnu ulogu u rješavanju proturječnosti između materijalnog i duhovnog, prirodnog i psihološkog, medicinskog i obrazovnog. (shrink)

The author emphasizes the fact that the largest part of Plato’s Timaeus deals with human nature and offers a detailed account of the constitution of the human body. He then lists the parallels and the differences between the constitution of the world body and the human body. The central part of the paper deals with Plato’s explanation of the persistence of the human body within a bodily environment which causes its dissolution. The author pays a special attention to Plato’s theory (...) of the apparatus which keeps running the processes of respiration, digestion and blood circulation. In the concluding section, the author raises thequestion of the relationship between human body and human soul. He shows that, in Plato’s Timaeus, the human body functions to a large extent independently from human soul. One possible reason for this theory is Plato’s conception of the immortal soul. While the human body exists in order to harbour the immortal soul, the latter does not produce and preserve it nor does it cause its dissolution. It only exercises cognitive and ruling functions in it as long as the body is able to hold together and to detain the soul. (shrink)