Full Idea
We value friendship for its own sake, even if we are not likely to get anything else from it.
Gist of Idea
We value friendship just for its own sake
Source
Aristotle (Topics [c.331 BCE], 117a03)
Book Reference
Aristotle: 'Posterior Analytics and Topica', ed/tr. Tredennick,H/Forster,ES [Harvard 1960], p.391
A Reaction
In 'Ethics' he distinguishes some friendships which don't meet this requirement. Presumably true friendships survive all vicissitudes (except betrayal), but that makes such things fairly rare.