To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.

It would be better if you began to teach others only after you yourself have learned something.

There two things that are infinite, human stupidity and the universe, I don't know about the universe

What is the meaning of human life, or of organic life altogether? To answer this question at all implies a religion.

But there is another reason for the high repute of mathematics: it is mathematics that offers the exact natural sciences a certain measure of security which, without mathematics, they could not attain.

I was very pleased with your kind letter. Until now I never dreamed of being something like a hero. But since you've given me the nomination I feel that I am one.

I wouldn't want to live if I did not have my work. In any case, it's good that I'm already old and personally don't have to count on a prolonged future.