There are no rules for friendship. It must be left to itself. We cannot force it any more than love.
FRIENDSHIP, THERE ARE NO RULES FOR FRIENDSHIP
A man's friendships are one of the best measures of his worth.
friendship, best measures, worth
You can always tell a real friend: when you've made a fool of yourself he doesn't feel you've done a permanent job.
Even where friendship is concerned, it takes me a long time to trust people.
friendship is , takes long time trust
Never explain - your friends do not need it and your enemies will not believe you anyway.