Abstract

In Nicomachean Ethics III.5, Aristotle argues that virtue and vice are “up to us and voluntary.” Readers have long struggled to make sense of Aristotle’s arguments in this chapter and to explain how they cohere with the rest of his ethical project. Among the most influential lines of complaint is that the argument of III.5 appears to contradict his emphasis elsewhere on the power of upbringing to shape character, beginning in childhood. Scholars have developed two main interpretive approaches to III.5, which I label “libertarian” and “compatibilist.” I argue that neither approach succeeds in removing the appearance of contradiction. I develop an alternative interpretation that reveals the coherence of Aristotle’s commitments, showing that for him the voluntariness of character and the power of upbringing are in reality two sides of the same philosophical coin. Both are grounded in his fundamental idea that virtue and vice are acquired by practice.