One friend in a lifetime is much; two are many; three are hardly possible.

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

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.

We are all full of weakness and errors; let us mutually pardon each other our follies—it is the first law of nature.

Whatever you do in life, surround yourself with smart people who'll argue with you.

A friend is as it were a second self.