Relativism, the position that things are for each as they seem to each, was first formulated in Western philosophy by Protagoras, the 5th century BC Greek orator and teacher. This book focuses on the challenge to the possibility of expert knowledge posed by Protagoras, together with responses by the three most important philosophers of the next generation, Plato, Aristotle, and Democritus. In his book Truth, Protagoras made vivid use of two provocative but imperfectly spelled out ideas. First, that everyone is (...) a ‘measure’ of the truth, and that everyone is already capable of determining how things are, since the senses are the best and most credible guides to the truth. Second, given that things appear differently to different people, there is no basis on which to decide that one appearance is true rather than the other. Plato developed these ideas into a more fully worked-out theory, which he then subjected to refutation in the Theaetetus. Aristotle argued that Protagoras’ ideas lead to skepticism in Metaphysics Book G, a chapter which reflects awareness of Plato’s reaction in the Theaetetus. Finally, Democritus incorporated modified Protagorean ideas and arguments into his theory of knowledge and perception. There have been many important recent studies of these thinkers in isolation. However, there has been no attempt to tell a single, coherent story about how Democritus, Plato, and Aristotle responded to Protagoras’ striking claim, and to its perceived implications about knowledge, perception, and truth. This book offers a new account of this important chapter in the development of Greek epistemology. (shrink)

This paper explores two ideas in Aristotle: the idea that a just person is necessarily a lawful and law-abiding citizen, and second, the idea that the virtuous person necessarily cares about the common good. In this paper, I show that justice and its concern for the common good is central to Aristotle’s conception of the virtuous agent, and that justice, in turn, cannot be understood apart from the various laws that states devise for the common benefit.

In this paper I consider Aristotle’s solutions to two questions about justice and the laws: why think that obeying the law is just? And why think that doing what is just will promote one’s happiness? I analyze Aristotle’s solutions to these two problems in terms of four claims concerning the laws that come from Plato and underwrite Aristotle’s optimism about the potential for politikê epistêmê to issue in laws which are objectively correct.

In this thesis, I present an account of the development of early Greek epistemology, according to which Protagoras' measure doctrine, and his argument from conflicting appearances, was the starting point for work on perception and knowledge by Plato in the Theaetetus, Aristotle in Metaphysics IV and Democritus. In Chapter One, I argue against the assumption that Protagoras' Aletheia contained a philosophical theory. It was probably not a treatise, but a virtuoso show-piece, with the aim of "knocking down" views according to (...) which truth is only known by gods, and, with difficulty, by privileged humans--namely, philosophers. For this, it need not have contained more than some well-chosen examples of perceptual and value beliefs, and arguments that one cannot decide which are true. In Chapter Two, I argue that Democritus should be seen as Protagoras' heir. Democritus argued Protagoras' general claim is self-refuting, but thought he was right about perceptual appearances. In Confirmations, he defended the senses, attributing to them knowledge and "power of proof." However, his theory led to an ancestor of the primary/secondary quality distinction, and this threatened to undermine the theory itself because of implications--that one can only know how things appear and not how things are by nature--which were later taken up in Pyrrhonist skepticism. In Chapter Three, I present a reading of the Secret Doctrine in Plato's Theaetetus as a defense and diagnosis of Protagoras' claim, in particular, an explanation of the global relativization which Protagoras' claim seems to recommend. This reading is meant to avoid the well-known difficulties concerning the prevailing interpretation of Protagoras' "Secret Doctrine" as a flux doctrine. I also argue that Plato developed the Secret Doctrine with Democritus in mind. In Chapter Four, I argue that Plato's "self-refutation argument" is aimed at relativism, but not relativism about truth. The latter, which Aristotle dismisses as eristical, is a position Protagoras can take, but Plato's argument works against it as well. In Chapter Five, I examine why Aristotle seems to treat Protagoras in Metaphysics IV as being committed to a denial of the principle of non-contradiction. (shrink)

This volume features new papers by an international group of scholars in ancient philosophy, with a particular focus on new work in ancient Greek and Roman ethics, epistemology, logic, and science.

Epicurus is usually credited with being the first to recognize, and disavow, determinism as a threat to freedom of the will . This common assumption has recently come under attack by Susanne Bobzien , and now also by Tim O’Keefe, who, in this rigorously argued but eminently readable book, examines the extant evidence for Epicurus’ views, and concludes that Epicurus was not concerned with the “modern” problem of free will at all.