In the company of friends, writers can discuss their books, economists the state of the economy, lawyers their latest cases, and businessmen their latest acquisitions, but mathematicians cannot discuss their mathematics at all. And the more profound their work, the less understandable it is.

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

I am grateful for the idea that has used me.

Violence as a way of gaining power... is being camouflaged under the guise of tradition, national honor [and] national security.

Far more unwaveringly, the neurotic keeps before his eye his God, his idol, his ideal of personality and clings to his guiding principle, losing sight in the meanwhile of reality, whereas the normal person is always ready to dispense with this crutch, this aid, and reckon unhampered with reality.

There is no such thing as talent. There is pressure.

We must interpret a bad temper as a sign of inferiority.