Full Idea
Where the object is pleasure or utility friendship is possible between bad men,…but obviously only good men can be friends for their own sakes.
Gist of Idea
Bad men can have friendships of utility or pleasure, but only good men can be true friends
Source
Aristotle (Nicomachean Ethics [c.334 BCE], 1157a16)
Book Reference
Aristotle: 'Ethics (Nicomachean)', ed/tr. ThomsonJ A K/TredennickH [Penguin 1976], p.265
A Reaction
If bad men try to be friends, they presumably become aware of the vices in the other person, and vices are usually fairly unfriendly.