Orthodoxy is the grave of intelligence, no matter what orthodoxy it may be.

The use of self control is like the use of brakes on train. It is useful when you find yourself in wrong direction but merely harmful when the direction is right

Artists are on the average less happy than men of science.

I can't tell whether I am living in a dream or a nightmare.

There are certain things that our age needs, and certain things that it should avoid. It needs compassion and a wish that mankind should be happy; it needs the desire for knowledge and the determination to eschew pleasant myths; it needs, above all, courageous hope and the impulse to creativeness.

Although this may seem a paradox, all exact science is based on the idea of approximation. If a man tells you he knows a thing exactly, then you can be safe in inferring that you are speaking to an inexact man.

Mathematics takes us into the region of absolute necessity, to which not only the actual word, but every possible word, must conform.