Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

We are boxed in by the boundary conditions of our thinking

The aim of science is, on the one hand, as complete a comprehension as possible of the connection between perceptible experiences in their totality, and, on the other hand, the achievement of this aim by employing a minimum of primary concepts and relations.

Mozart's music is so pure and beautiful that I see it as a reflection of the inner beauty of the universe.

You think you have troubles with mathematics . . . I assure you mine are still bigger.

You cannot prepare for war and peace at the same time.

Never lose a holy curiosity. Try not to become a man of success but rather try to become a man of value. He is considered successful in our day who gets more out of life than he puts in. But a man of value will give more than he receives.