This paper concerns the status of Aristotle’s claim that a friend is another self in NE IX.4. Against the prevailing interpretation, I defend the view that Aristotle uses the other-self claim to explain how a virtuous person who values himself will come to value his friend, according to which 1) loving a friend is an extension of self-love, and 2) the conception of the friend as another self explains how the friend’s eudaimonia becomes constitutive of the agent’s eudaimonia. I argue (...) that this view, properly construed, is defensible from two objections: that it is narcissistic, and that it is incompatible with Aristotle’s insistence that we value our friends for their sakes. According to Aristotle, virtuous friends become other selves to one another by engaging in a process I call “reciprocal shaping,” a process by which friends develop a shared character. If virtuous friends value one another on account of character as Aristotle claims, then they value one another on account their shared character. (shrink)

A widely accepted thesis in the philosophy of friendship is what I call "the self-knowledge thesis," which says that good friendship is essentially such as to conduce to self-knowledge. I argue in this paper that the self-knowledge thesis is false. Good friendship need not conduce to self-knowledge, for it is part of the nature and value of friendship that it might lead us to form false beliefs about ourselves.