Lovable

But now if one receives someone as a friend on the basis that he is good, but then he becomes, and seems, a bad character, should one go on loving him? Or is this not possible, given that not everything is lovable, but only what is good, and what is worthless is neither lovable, nor something one should love (for one should not be a lover of what is worthless, nor become like it, and it has been said that like is a friend to like)? So should one break off the friendship at once; or not in all cases, only where the badness is incurable.

Aristotle Nicomachean Ethics, p.229, 1165b15