Full Idea
Learn to thrust friendship aside, or rather the dream of friendship. To desire friends is a great fault. Friendship should be a gratuitous joy like those afforded by art or life. …Friendship is to be exercised (it is a virtue).
Gist of Idea
Friendship is a virtue, not a state we should dream of
Source
Simone Weil (Gravity and Grace [1942], 'Love')
Book Reference
Weil,Simone: 'Gravity and Grace', ed/tr. Crawford/De Ruhr [Routledge 1952], p.66
A Reaction
Presumably we won't have friends if we aren't friendly. Yearning for love is not love. She sounds a bit of a romantic here - that everything must come naturally, or not at all. Desiring friends may be a strategic error - but 'a great fault'?