It is not men that interest or disturb me primarily; it is ideas. Ideas live; men die.

Friendship is the only cement that will ever hold the world together.

Conformity will be the only virtue and any man who refuses to conform will have to pay the penalty.

The only thing that saves the world is the little handful of disinterested men that are in it.

The natural man inevitably rebels against mathematics, a mild form of torture that could only be learned by painful processes of drill.

We are citizens of the world. The tragedy of our times is that we do not know this.

The fewer the desires, the more peace.