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The ‘Digression’ In Plato’S Theaetetus: A New Interpretation, David Levy

The Society for Ancient Greek Philosophy Newsletter

In this paper I argue that the “digression” (Tht. 172D-177C) plays a central role in Plato’s overall critique of Protagoras’s measure doctrine. Properly understood, the digression itself constitutes an argument against accepting a particular interpretation of the measure doctrine. This argument is based upon the unacceptable moral and political consequences that result from an institutional validation of extreme conventionalism. Commentators, such as Robin Waterfield and Gilbert Ryle, who dismiss this passage as pointless, and translators, such as Gwynneth Matthews, who omit the passage entirely, fail to draw the important connections among the measure doctrine, the Athenian legal system …