There are no rules for friendship. It must be left to itself. We cannot force it any more than love.
All love that has not friendship for its base, is like a mansion built upon the sand.
One of the surest evidences of friendship that one individual can display to another is telling him gently of a fault. If any other can excel it, it is listening to such a disclosure with gratitude, and amending the error.
Love between man and man is impossible because there must not be sexual intercourse and friendship between man and woman is impossible because there must be sexual intercourse.
It must be remembered that the sea is a great breeder of friendship. Two men who have known each other for twenty years find that twenty days at sea bring them nearer than ever they were before, or else estrange them.