Through a reading of the Myth of Er and Socrates' conversation with Cephalus, I will argue that merely conventional virtue is highly unstable and unreliable. Virtue acquired by convention proves foundationless outside the confines of the political regime that establishes those conventions, and a tendency toward an unreflective moral complacency on the part of the conventionally virtuous leaves them in particular danger of committing unjust actions. Socrates recommends the study of philosophy because it can ground conventionally acquired virtue and, even (...) more importantly, because it is capable of shaking the moral complacency that afflicts the conventionally virtuous. (shrink)