The paper argues that everyday ethical expertise requires an openness to an experience of self-doubt very different from that involved in becoming expert in other skills—namely, an experience of profound vulnerability to the Other similar to that which Emmanuel Levinas has described. Since the experience bears a striking resemblance to that of undergoing cross-examination by Socrates as depicted in Plato’s early dialogues, I illustrate it through a close reading of the Euthyphro, arguing that Euthyphro’s vaunted “expertise” conceals a reluctance to (...) submit himself to the basic process of self-redefinition that results from learning the limits of one’s knowledge. I show how the dialogue itself models the disruptive experience of selfquestioning that leads to moral maturity, providing further evidence that expertise has an important non-cognitive element, as well as casting doubt on the ethical value of seeking “definitions” of the virtues. (shrink)