If you want to know who your friends are, get yourself a jail sentence.
A sure friend is known in unsure circumstances.
The shifts of fortune test the reliability of friends.
Wise were the kings who never chose a friend till with full cups they had unmasked his soul, and seen the bottom of his deepest thoughts.
Friendship is tested in the thick years of success rather than in the thin years of struggle.
Every one that flatters thee Is no friend in misery. Words are easy, like the wind, Faithful friends are hard to find.
The best way to find out if you have any friends is to go broke. The ones that hang on longest are your friends. I don't mean the ones that hang on forever. There aren't any of those.
Prove your friend ere you have need, but in deed A friend is never known till a man have need.
The test of friendship is assistance in adversity, and that, too, unconditional assistance.