There is some self-interest behind every friendship. There is no friendship without self-interests. This is a bitter truth.

I have friends in overalls whose friendship I would not swap for the favor of the kings of the world.

Be slow to fall into friendship, but when you are in, continue firm and constant.

It is not a lack of love, but a lack of friendship that makes unhappy marriages.

The beauty of enmity is insecurity; the beauty of friendship is in security.

Depth of friendship does not depend on length of acquaintance.