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Full Idea
Self-indulgent desire makes a person incapable of co-operation, which is a prerequisite of friendship.
Gist of Idea
Self-indulgent desire makes friendship impossible, because it makes a person incapable of co-operation
Source
Plato (Gorgias [c.378 BCE], 507e)
Book Ref
Plato: 'Gorgias', ed/tr. Waterfield,Robin [OUP World's Classics 1994], p.106