The shifts of fortune test the reliability of friends.

If a man could mount to heaven and survey the mighty universe, his admiration of its beauties would be much diminished unless he had some one to share in his pleasure

Friendship makes prosperity brighter, while it lightens adversity by sharing its griefs and anxieties. [Lat., Secundas res splendidiores facit amicitia, et adversas partiens communicansque leviores.]

It is a common saying that many pecks of salt must be eaten before the duties of friendship can be discharged. [Lat., Vulgo dicitur multos modios salis simul edendos esse, ut amicitia munus expletum sit.]

Friendship improves happiness, and abates misery, by doubling our joys, and dividing our grief

A friend is, as it were, a second self.