 A common complaint about Aristotle’s attempt to defend his conception of happiness is that his argument is too general to show that it is in one’s interest to possess any of the particular virtues as they are traditionally conceived. Suppose we grant, at least for the sake of argument, that doing anything well, including living well, consists in exercising certain skills; and let us call these skills, whatever they turn out to be, virtues. Even so, that point does not by itself allow us to infer that such qualities as temperance, justice, courage, as they are normally understood, are virtues. They should be counted as virtues only if it can be shown that actualizing precisely these skills is what happiness consists in. What Aristotle owes us, then, is an account of these traditional qualities that explains why they must play a central role in any well-lived life.