This article aims at reconstructing the logic and assessing the force of Socrates' argument against Protagoras' 'Measure Doctrine' at Theaetetus 171a–c. I examine and criticise some influential interpretations of the passage, according to which, e.g., Socrates is guilty of ignoratio elenchi by dropping the essential Protagorean qualifiers or successfully proves that md is self-refuting provided the missing qualifiers are restored by the attentive reader. Having clarified the meaning of MD, I analyse in detail the broader section 170a–171d and argue, against (...) an extensive scholarly consensus, that it contains two slightly different formulations of the same argument, and not two distinct arguments, that Socrates does not highlight his own strategy at 171a–c as especially clever, and that his argument successfully shows that md turns out to be untenable for Protagoras himself when submitted to scrutiny in dialectical contexts, without aiming at proving its absolute falsehood. Finally, I clarify the philosophical import of the final image of Protagoras' momentary return from the underworld. (shrink)

Plato's dialogues are set in fifth century Athens but they are performed for a fourth century audience. The context of his dialogues, then is wider perhaps than other philosophers and because of the difference in periods, it is clear that it is necessary for an audience member to possess knowledge of the events of the previous generation, viz., the fifth century BCE. When its cultural context is taken into account, the Theaetetus can not be read as an attempt by Plato (...) to establish an epistemology in the modern sense of the term. While the characters of the dialogue are searching for the 'essence' of knowledge, Plato is teaching the audience of the dialogue to consider the knowledge that different practices of paideia produce and to evaluate that knowledge in light of its implications on the individual and the polis. The answer that emerges is that philosophy is the paideia that will produce the best individual and the best polis, because it is only the practice of philosophy that teaches intellectual virtue. The Theaetetus is an account of the practice of philosophy and the practitioner of philosophy. (shrink)

This paper discusses two broadly logical issues related to Protagoras’ measure doctrine (M) and the self-refutation argument (SRA). First, I argue that the relevant interpretation of (M) has it that every individual human being determines all her own truths, including the truth of (M) itself. I then turn to what I take to be the most important move in the SRA: that Protagoras recognises not only that his opponents disagree with him about the truth of (M), but also that they (...) hold that (M) is false simpliciter. By recognising that his opponents do not make the relativising concession he makes for them, he is forced to accept that (M) is false. I go on to argue that several other defenders of the SRA end up with a regress which is difficult to end and might not favour anti-Protagoreans. On my reading, by recognising what his opponents believe, Protagoras is barred from adding qualifiers, and the possible regress doesn’t get off the ground. I conclude with brief discussions of how Protagoras might try to avoid the result of the SRA and the argument’s role in this part of the Theaetetus. (shrink)

Two readings of the much-discussed περιτροπή argument of "Theaetetus" 170c-171c have dominated the literature. One I call "the relativity reading". On this reading, the argument fails by ignoratio elenchi because it "carelessly" omits "the qualifications 'true for so-and-so' which [Protagoras'] theory insists on" (Bostock 1988: 90). The other reading I call "the many-worlds interpretation". On this view, Plato's argument succeeds in showing that "Protagoras' position becomes utterly self-contradictory" because "he claims that everyone lives in his own relativistic world, yet at (...) the same time he is forced by that very claim to admit that no one does" (Burnyeat 1976b: 48). I discuss and criticise both readings, and present a third, according to which the point of the argument is, very roughly, that Protagoras is committed to equating truth and truth-for, and so, further, to their intersubstitutability. This further commitment proves fatal to his argument. (shrink)

Cet article examine le fragment de l’homme-mesure de Protagoras, tout d’abord en exposant les grands courants de son interprétation, ensuite et surtout en présentant les positions respectives et antagonistes de Nietzsche et Heidegger. Heidegger, contre Nietzsche, fait reposer l’homo-mensura sur un arrière-fond ontologique et platonicien, où la mesure n’est possible que depuis l’ouverture ontologique qui la précède. Cette interprétation a sa légitimité historique et philologique. Mais Nietzsche comprend le fragment comme entièrement irréductible au platonisme : Protagoras (et son frère de (...) pensée Thucydide) aurait pensé la connaissance comme l’étude de types psychologiques, non pas selon une norme épistémique stable, mais selon les variations d’intensité qui touchent toute psychè mais aussi toute communauté sociale. Je prends appui sur cette dernière intuition pour dégager ce qui me semble l’interprétation la plus riche du fragment de l’homme-mesure, à partir des remarques d’Eugène Dupréel – une interprétation sociale et normative où Protagoras est le penseur d’une praxis (la médecine, la politique…) qui, dans une situation et dans une communauté données, est capable d’améliorer les impressions subjectives du plus grand nombre. (shrink)