The mathematical life of a mathematician is short. Work rarely improves after the age of twenty-five or thirty. If little has been accomplished by then, little will ever be accomplished.

Follow your heart always, and remember to take your head along with you.

The educator must believe in the potential power of his pupil, and he must employ all his art in seeking to bring his pupil to experience this power.

The only normal people are the ones you don't know very well.

The test of one's behavior pattern is their relationship to society, relationship to work and relationship to sex.

Meanings are not determined by situations, but we determine ourselves by the meanings we give to situations.

In a country of such recent civilization as ours, whose almost limitless treasures of material wealth invite the risks of capital and the industry of labor, it is but natural that material interests should absorb the attention of the people to a degree elsewhere unknown.