Originally published in 1990. This book discusses in a philosophically responsible and illuminating way the progress of the dialogue and its separate sections to improve our understanding of Plato’s work on Theaetetus. An early coverage of this dialogue, this investigation predated a surge in study of Plato’s piece which examined Socratic and pre-Socratic thought. The author’s argument is that the _Theaetetus_ engages in re-evaluation of earlier doctrines of middle-period Platonism as well as reaffirming theories about knowledge. An important work (...) in Platonic studies and epistemology. (shrink)

Plato's Theaetetus investigates the nature of knowledge. Socrates converses with two mathematicians, Theaetetus and Theodorus, who cannot arrive at the necessary and sufficient conditions of knowledge. Theaetetus offers three definitions, none of which can withstand scrutiny. Most commentators on the Theaetetus examine the arguments put forward and, by constructing a definition of knowledge, attempt to complete what Plato began. But analysis of the various definitions offered is incomplete as an investigation of the dialogue. ;Before Socrates (...) elicits from Theaetetus the first definition of knowledge as perception, he characterizes himself as a midwife. And before readers are introduced to Socrates, we encounter Euclides as the alleged "author" of the dialogue. It is incumbent upon the reader to notice all the elements that Plato offers and to examine whether the dramatic setting of the arguments sheds light on their outcome. The inner frame of the dialogue reveals that the nature of Theaetetus's soul is under investigation as much as the nature of knowledge. The nature of writing and memory, discussed in the outer frame, are incorporated in the second definition of knowledge as opinion, and in the third definition as true opinion with logos. Logos is the unifying principle of the dialogue, in that Socrates' dissection of the three meanings of logos recapitulates the three definitions of knowledge. ;A rigorous reading, incorporating both the action and the speeches of the dialogue, shows that the Theaetetus exhibits the essential ingredients of knowledge. The lengthy examination of perception shows it as model for knowledge, in that an account is needed of both the knower and the known, before a complete definition is possible. Thus the Theaetetus is a guide on the way to knowledge. By the end we have a thorough understanding of both the need for a structure of soul and for the structure of that which is to be known, as well as the tool, logos, which would enable us to put the two together in a definition of knowledge. (shrink)

Timothy Chappell’s new translation of the Theaetetus is presented here in short sections of text, each preceded by a summary of the argument and followed by his philosophical commentary on it. Introductory remarks discuss Plato and his works, his use of dialogue, the structure of the Theaetetus, and alternative interpretations of the work as a whole. A glossary and bibliography are provided.

_Theaetetus_, the _Sophist_, and the _Statesman_ are a trilogy of Platonic dialogues that show Socrates formulating his conception of philosophy as he prepares the defense for his trial. Originally published together as _The Being of the Beautiful_, these translations can be read separately or as a trilogy. Each includes an introduction, extensive notes, and comprehensive commentary that examines the trilogy's motifs and relationships. "Seth Benardete is one of the very few contemporary classicists who combine the highest philological competence with a (...) subtlety and taste that approximate that of the ancients. At the same time, he as set himself the entirely modern hermeneutical task of uncovering what the ancients preferred to keep veiled, of making explicit what they indicated, and hence...of showing the naked ugliness of artificial beauty."—Stanley Rose, _Graduate Faculty Philosophy Journal_ Seth Benardete was professor of classics at New York University. He was the author or translator of many books, most recently _The Argument of the Action, Plato's "Laws," and Plato's "Symposium,"_ all published by the University of Chicago Press. (shrink)

In the Theaetetus, Plato looks afresh at a problem to which, he now realizes, he had earlier given an inadequate answer: the problem of the nature of knowledge. What Plato has to say on this question is of great interest and importance, not only to scholars of Plato, but also to philosophers with wholly contemporary interests. This book is a sustained philosophical analysis and critique of the Theaetetus. David Bostock provides a detailed examination of Plato's arguments and (...) the issues that they raise. He adjudicates on rival interpretations of the text, and looks at the relations between this and other works of Plato. The book does not presuppose any knowledge of Greek. (shrink)

Section 1 contrasts the approaches to Plato of F.M.Cornford and Gilbert Ryle, two of the early twentieth century’s leading Plato interpreters. Then I trace and evaluate attempts to discern in Plato’s Theaetetus a recognition of the role of the proposition. Section 2 focuses on the hunting of the proposition in Socrates’ Dream in the Theaetetus. Ryle, inspired by Logical Atomism, argued that Plato there anticipated an insight about the difference between names and propositions that Russell credited to Wittgenstein. (...) I rehearse difficulties for understanding the logos of the Dream as a proposition, preferring a reading of logos there as something like definition: a reading Wittgenstein also adumbrated. Section 3 examines attempts by writers such as Burnyeat and Kahn to find Plato allocating a starring role to the proposition in the argument at Theaetetus 185–6: perception, since it cannot grasp being, cannot grasp truth and hence cannot be knowledge. On their reading a grasp of being is understood as a grasp of something propositional. Problems for the propositional reading include Socrates’ talk of grasping ‘the truth of something’ (alētheia tinos), and the way the dialogue develops after 186. (shrink)

Zina Giannopoulou offers a new reading of Theaetetus, Plato's most systematic examination of knowledge, alongside Apology, Socrates' speech in defence of his philosophical practice, and argues that the former text is a philosophical ...

This book is a tour de force in the Oxford tradition of philosophical commentaries. Bostok's interest is not primarily the drama, characters, or setting of the Theaetetus, but the interpretation and evaluation of the arguments presented therein. Consequently, the dialogue receives a rather different treatment than the one to be found in Seth Benardete's The Being of the Beautiful, which is not mentioned by Bostok. Bostok's analysis of the Theaetetus is set against a background of ancient, modern, and (...) contemporary epistemology. For historical context Bostok draws mostly on the other works of Plato, though he also discusses the views of Protagoras and Heraclitus concerning perception and flux, respectively. The tradition in epistemology against which the Theaetetus is subsequently measured begins with the British empiricists Locke, Berkeley, and Hume, and includes twentieth-century analytic philosophers like Russell, Quine, and Kripke. Bostok's style is remarkably clear and engaging, and his account of the significance of the Theaetetus, while restricted in scope, is penetrating and masterly. The book contains a very brief preface, an ample introductory chapter on the place of the Theaetetus in Plato's philosophy, two main sections--appropriately titled "Knowledge and Perception" and "Knowledge and Belief"--and a modest bibliography and index. (shrink)

IN A PREVIOUS ARTICLE I argued that Plato’s Line of Knowledge in the middle of his Republic taught a “pedagogy of complete reflection.” What I intend to show in this article is that the general lines of that “complete reflection” indicated in the Republic are brought down to the everyday in the Theaetetus where we are invited, among other things, to reflect upon what is involved in the fact that we are reading the dialogue in our lifeworld.

The Theaetetus is one of the most widely studied of any of the Platonic dialogues because its dominant theme concerns the significant philosophical question, what is knowledge? In this book Paul Stern provides a full-length treatment of its political character in relationship to this dominant theme. He argues that this approach sheds significant light on the distinctiveness of the Socratic way of life, with respect to both its initial justification and its ultimate character. More specifically, he argues that Socrates' (...) revolutionary decision to subject political life to philosophic reflection, the decision that leads directly to his trial and execution, is based on his awareness of the elusiveness of comprehensive knowledge and the implications of that elusiveness for the validity of philosophic inquiry. This view of Socrates' rationale has important consequences for our understanding of political philosophy and of the validity of the life of reason itself. (shrink)

Socrate's dialogue with the young student, Theaetetus, is a case of the highest form of education: a ‘divine service’ to the state of Athens, to Theaetetus' family and friends, and to Theaetetus himself. It is less a means for Socrates (or Plato) to present his theory of knowledge than a sort of ‘noble lie’ designed and intended by Socrates to keep Theaetetus both appropriately humble and hungry for wisdom. The progress of the dialogue is an allegory (...) of moral education, a picturing of what Aristotle later laid out more pedantically in the Nicomachean Ethics. (shrink)

Scholars who have taken interest in Theaetetus' educational theme argue that Plato contrasts an inferior, even dangerous, sophistic education to a superior, philosophical, Socratic education. I explore the contrasting exhortations, methods, ideals and epistemological foundations of Socratic and Protagorean education and suggest that Socrates' treatment of Protagoras as educator is far less dismissive than others claim. Indeed, Plato, in Theaetetus, offers a qualified defence of both Socrates and Protagoras. Socrates and Protagoras each dwell in the middle ground between (...) the extremes presented in the dialogue's digression, which contrasts the life of the philosopher and the life of the courtroom orator. Both Socrates and Protagoras demonstrate a serious engagement with both politics and philosophy. Theodorus presents an educational option in which theory is divorced from politics while an ignoble sophistic education is presented as political but divorced from theory. Protagorean education, in Theaetetus, emerges as superior to a base sophistic education, though it remains inferior to Socratic education. (shrink)

We examine the "Theaetetus" in the light of its juxtaposition of philosophical, mathematical and sophistical approaches to knowledge, which we show to be a prominent feature of the drama. We suggest that clarifying the nature of philosophy supersedes the question of knowledge as the main ambition of the "Theaetetus". Socrates shows Theaetetus that philosophy is not a demonstrative science, like geometry, but it is also not mere word-play, like sophistry. The nature of philosophy is revealed in Socrates' (...) activity of examination and his refusal to deny his ignorance about knowledge. (shrink)

The account of knowledge in Plato’s Theaetetus, as true belief meta logou, seems to lead to a regress, which may be avoided by defining one kind of knowledge as true belief that rests on a different kind of knowledge. I explore a specific version of this move: to define knowledge as true belief that results from a successful and proper exercise of a rational capacity (a dunamis meta logou).

Unlike most readings of Plato’s Theaetetus, which concentrate on gnoseology, this paper places it in the debate on commensurable and incommensurable magnitudes that distinguished Greek philosophical and mathematical thought at the beginning of the 4th century BC and in which Theaetetus played a leading role. The argumentation of the dialogue shows clearly how this debate was important for Plato, to the point that the entire dialogue can be considered as an attempt to consider seriously how incommensurability, and its (...) ontological correlate, the concept of dynamis, could elaborate a new form of logos. (shrink)

THE OPENING OF THE THEAETETUS is curious. The report we have of another opening of nearly the same length indicates that it was always a curiosity. If both openings are Plato’s, and the rest of the dialogue they preface were not different, then Plato changed his mind about how to start off the trilogy to which the Theaetetus belongs. If the second version is spurious, someone thought he could surpass Plato and make a more sensible introduction. If ours (...) is spurious, however, then we cannot hope to interpret it. If we assume its genuineness and that it represents Plato’s only or final recension—the other one is said to be spurious and rather frigid—then the Theaetetus opens with our listening in on a recital of the conversation Socrates had with Theaetetus and Theodorus shortly before his death, while we supposedly are hearing it in Megara many years after the conversation occurred. (shrink)

Plato's Theaetetus is an acknowledged masterpiece, and among the most influential texts in the history of epistemology. Since antiquity it has been debated whether this dialogue was written by Plato to support his familiar metaphysical doctrines, or represents a self-distancing from these. David Sedley's book offers a via media, founded on a radical separation of the author, Plato, from his main speaker, Socrates. The dialogue, it is argued, is addressed to readers familiar with Plato's mature doctrines, and (...) sets out to show how these doctrines, far from being an abandonment of his Socratic heritage, are its natural outcome. The Socrates portrayed here is the same Socrates as already portrayed in Plato's early dialogues. While not a Platonist, he is exhibited - to put it in terms of an image made famous by this dialogue - as having been Platonism's midwife. In a comprehensive rereading of the text, Sedley tracks the ways in which Socrates is shown unwittingly preparing the ground for Plato's mature doctrines, and reinterprets the dialogue's individual arguments from this perspective. The book is addressed to all readers interested in Plato, and does not require knowledge of Greek. (shrink)

This dissertation is a study of Plato's Theaetetus . I argue that the Theaetetus is fundamentally an extended reductio of a radical materialist view---the view that the only things that there are perceptible, material particulars with no properties or relations. Based on evidence from the Sophist---the sequel dialogue to the Theaetetus---I show that, according to Plato, this radical materialism results from ignoring the intelligible Forms and the participation of things in them. The radical materialist ontology also (...) implies a certain view of judgments and statements, essentially the view that judging or stating is naming or identifying the thing that is judged or stated. ;I read the discussion of the thesis that knowledge is true judgment in the second part of the Theaetetus as, first illustrating difficulties that the radical materialist view gives rise to in explaining the possibility of false judgment, but then indicating how false judgment can occur on that view, only to show that the radical materialist cannot give an account of simple arithmetical mistakes on his assumptions. ;The third part of Theaetetus, dealing with the thesis that knowledge is true judgment with an account, concentrates on the implications of radical materialism for the unity and complexity of objects; the radical materialist cannot give an account of how there can be a whole with parts. He also cannot explain the possibility of systematic knowledge and expertise in a field, such as arithmetic or grammar, because of his commitment to the particularity of what there is, and therefore, of what is known. (shrink)

In this paper I argue that in the digression in Plato’s Theaetetus godlikeness may be construed as Socrates’ ethical achievement, part and parcel of his art of mental mid­wifery. Although the philosophical life of contemplation and detachment from earthly affairs exemplifies the human ideal of godlikeness, Socrates’ godlikeness is an inferior but legitimate species of the genus. This is the case because Socratic godlikeness abides by the two requirements for godlikeness that Socrates sets forth in the digression: first, it (...) is a kind of escape from the phenomenal world; and second, it allows Socrates to become just and pious with wisdom. The crucial difference between Socrates and the philosopher that prevents the former from being as godlike as the latter is his epistemic barrenness, on account of which he cannot define the constitutive virtues of godlikeness, i.e., justice, piety, and wisdom. As a barren midwife of the intellect, Socrates practices godlikeness but does not have a philosophical understanding of its nature. Nevertheless, by extolling the life of the philosopher he urges others to aspire to what he can never attain, philosophical godlikeness. (shrink)

In this paper, I examine several key issues relating to the definition of knowledge as perception in the first part of Plato's Theaetetus. I begin by explaining the workings of the ‘secret doctrine’ of perception, which is introduced in order to support the idea that perception is incorrigible, and then turn to examine the two refutations of the definition of knowledge as perception which appear at the end of the first part of the Theaetetus. I shall present (...) and explain distinct lines of interpretation pertaining to these passages and explore the consequences they attempt to draw regarding Plato's views on the perceptual world, the nature of perception and how these bear on his conception of knowledge. (shrink)

The Theaetetus provides Plato's fullest discussion of human knowledge and is a rich vehicle for reflection upon its topic. Polansky's commentary demonstrates that the dialogue in fact holds the complete Platonic account of knowledge -- an account which is as sophisticated as any offered by contemporary philosophers.

PHILOSOPHY BEGINS IN WONDER--so says Socrates in the Theaetetus-- but where does it end? The Theaetetus itself ends in such a puzzling way as to be the cause of apparently interminable dispute. Although its theme is the nature of knowledge, neither Socrates nor his interlocutors ever present a definition that gains unanimous approval. The definitions of knowledge as perception, as true opinion and as true opinion with an account are all rejected. This fact has understandably inclined most interpreters (...) to maintain that the dialogue fails to reach its explicit goal. Nevertheless, Socrates' attitude about the apparent failure of his conversation with Theaetetus is markedly distinct from his express attitude in those early dialogues with which the Theaetetus is often compared. Whereas early dialogues conclude with self-deprecation and exhortation to continue the quest, the Theaetetus concludes in satisfaction, indifferent to the possibility of further study. As midwife Socrates has successfully delivered Theaetetus of his phantom offspring; beyond that he can do no more. Thus the apparently negative conclusions of the dialogue are at least not negatively intoned, and readers can barely avoid the suspicion of having missed something. One response is to argue that an authorized definition of knowledge can be found by a careful reexamination of the very arguments Socrates rejects. But the fact that our suspicion is aroused by a dramatic consideration commends a search for resolution through the drama, however that might happen to bear on the problem of knowledge. (shrink)

"theaetetus" of the thesis that knowledge is sense-perception. After a brief defence of plato's handling of this thesis it is shown how the argument can, by the addition of one premiss, be rendered valid. A strong form of the 'proper objects' doctrine of perception is revealed as a crucial premiss. An implication of the argument is seen to be that perception in itself is unable to found an ordered and coherent picture of the world. A similar point, it (...) is argued, lies behind certain passages in the central books of the "republic". A tentative conclusion is that in the "theaetetus" plato retains and indeed sharpens the views about the sensible world which he expresses in the "republic". (shrink)

Plato, as a poet, employs muthos extensively to express his philosophical dialectical development, so the majority of his dialogues are comprised of muthoi. We cannot separate his muthos from his philosophical thought, since the former has great influence in the latter. So the methodology of this paper is first to discuss the dialogue "Theaetetus" to find out why he compares Socrates to the Greek goddess Artemis; then his concept of Maieutikē will be investigated. At the beginning of Plato’s " (...) class='Hi'>Theaetetus", Socrates first likens himself to the goddess Artemis, who, though unmarried, has a duty to assist women in labour. Socrates’ role, as Plato portrays, is the same as that of Artemis; and the technē he possesses is Maieutikē, which is to assist his students in giving birth to their mental offspring. This paper will focus on discussion on the Socratic mythological role in Platonic interpretation and dialectics so as to reveal the philosophical meaning of Socratic ignorance. (shrink)

_The Being of the Beautiful_ collects Plato’s three dialogues, the _Theaetetus_, _Sophist_, and _Statesmen_, in which Socrates formulates his conception of philosophy while preparing for trial. Renowned classicist Seth Benardete’s careful translations clearly illuminate the dramatic and philosophical unity of these dialogues and highlight Plato’s subtle interplay of language and structure. Extensive notes and commentaries, furthermore, underscore the trilogy’s motifs and relationships. “The translations are masterpieces of literalness.... They are honest, accurate, and give the reader a wonderful sense of the (...) Greek.”—Drew A. Hyland, _Review of Metaphysics_. (shrink)

Through the explorations of excellent scholars, this book provides a new understanding of Plato's _Theaetetus_, an absolute masterpiece which contains fundamental insights – about the nature of human cognition, perception, rationality – which are still at the centre of the contemporary debate.

The Unity of Oneness and Plurality in Plato's Theaetetus is a commentary on a single Platonic dialogue that offers readers an example of what it means to meaningfully engage with a dialogue on its own terms. In the process of engaging with the Theaetetus, the book offers an account of a general Platonic epistemology and ontology.

The digression of Plato’s Theaetetus (172c2–177c2) is as celebrated as it is controversial. A particularly knotty question has been what status we should ascribe to the ideal of philosophy it presents, an ideal centered on the conception that true virtue consists in assimilating oneself as much as possible to god. For the ideal may seem difficult to reconcile with a Socratic conception of philosophy, and several scholars have accordingly suggested that it should be read as ironic and directed only (...) at the dramatic character Theodorus. When interpreted with due attention to its dramatic context, however, the digression reveals that the ideal of godlikeness, while being directed at Theodorus, is essentially Socratic. The function of the passage is to introduce a contemplative aspect of the life of philosophy into the dialogue that contrasts radically with the political-practical orientation characteristic of Protagoras, an aspect Socrates is able to isolate as such precisely because he is conversing with the mathematician Theodorus. (shrink)

Turnbull offers a close and detailed reading of the Parmenides, using his interpretation to illuminate Plato's major late dialogues. The picture presented of Plato's later philosophy is plausible, highly interesting, and original.

Journal Name: Apeiron Issue: Ahead of print.

If your philosophical edifice rests on the idea of the Good, and you believe that wisdom consists in knowing and doing the Good, then it is incumbent upon you at some point to explain what it means to know the Good. In order to do that, you probably need to explain what it means to know anything at all. You need to answer the question, "what is knowledge?". Plato asks that question in the Theaetetus. If answering it requires giving (...) a definition of knowledge in general, he fails to give an answer. Worse, the dialogue suggests that it is impossible to define knowledge. The result is a failure not only for epistemology, but for any politics or ethics based on knowledge of the Forms. The pursuit of wisdom falls by the wayside, unmasked as quixotry. ;I argue that there are several long and important passages in the Theaetetus which are centrally concerned with the question of how the pursuit of wisdom can be rescued from the failure of epistemology. To that end, I focus on the definition of knowledge as perception, and argue that Plato means its failure to reveal problems which will plague any attempt to define knowledge. I then analyse two passages which make wisdom their central concern, namely the "Apology of Protagoras" and the "Digression" . Finally, I suggest that Plato provides a model for understanding the rationally inaccessible nature of knowledge and its relation to wisdom. The model is given in Theaetetus' definition of irrational square roots, which is offered at the outset of the discussion as a paradigm for defining knowledge. Theaetetus defines irrational roots in terms of their productive powers; this provides a model for wisdom, insofar as wisdom is a kind of knowledge which produces practical activity, i.e., insofar as to know the Good is to do the Good. If the knowledge contained in wisdom cannot be defined in itself, it can be defined through its productive power. (shrink)

The paper offers an interpretation of a disputed portion of Plato’s Theaetetus that is often called the Secret Doctrine. It is presented as a process ontology that takes two types of processes, swift and slow motions, as fundamental building blocks for ordinary material objects. Slow motions are powers which, when realized, generate swift motions, which, in turn, are subjectively bundled to compose sensible objects and perceivers. Although the reading of the Secret Doctrine offered here—a new version of the “Causal (...) Theory interpretation”—is not without problems, these problems are acknowledged in Plato’s text, confirming that this interpretation is correct. (shrink)