An intelligent enemy is better than a stupid friend.

A friend is as it were a second self.

I lay it down as a fact that if all men knew what others say of them, there would not be four friends in the world.

For friendship, like freedom, must be tended.

Don't walk behind me; I may not lead. Don't walk in front of me; I may not follow. Just walk beside me and be my friend.

The key is to keep company only with people who uplift you, whose presence calls forth your best.

We are not enemies, but friends. We must not be enemies. Though passion may have strained, it must not break, our bonds of affection.

Plato is my friend; Aristotle is my friend, but my greatest friend is truth.