Man's restlessness makes him strive.

Everything we do has a result. But that which is right and prudent does not always lead to good, nor the contrary to what is bad.

I have heard myself accused of being an opponent, an enemy of mathematics, which no one can value more highly than I, for it accomplishes the very thing whose achievement has been denied me.

We talk too much. We should talk less and draw more.

For many people, one of the most frustrating aspects of life is not being able to understand other people's behavior.

One must keep repeating the Truth.

Solitude is fine when you are at peace with yourself and have something definite to do.