It is one of the most effective attitudes of the neurotic to measure thumbs down, so to speak, a real person by an ideal, since in doing so he can depreciate him as much as he wishes.

More important than innate disposition, objective experience, and environment is the subjective evaluation of these. Furthermore, this evaluation stands in a certain, often strange, relation to reality.

A lie would have no sense unless the truth were felt as dangerous.

It is from among such individuals that all human failures spring.

The chief danger in life is that you may take too many precautions.

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.

If you wish to educate a child who has gone wrong, then you must, above all, keep your attention fixed on the intersection of two charmed circles.