Ninety nine failed solutions equals a gain of 99 pieces of information.

The ordinary adult never gives a thought to space-time problems ... I, on the contrary, developed so slowly that I did not begin to wonder about space and time until I was an adult. I then delved more deeply into the problem than any other adult or child would have done.

If you're not sure why you're doing something, you can never do enough of it. Imagination is more important than knowledge.

It is not a lack of real affection that scares me away again and again from marriage. Is it a fear of the comfortable life, of nice furniture, of dishonor that I burden myself with, or even the fear of becoming a contented bourgeois.

I don't teach my students, I provide the circumstances in which they can learn.

What is this frog and mouse battle among the mathematicians?

That deep emotional conviction of the presence of a superior reasoning power, which is revealed in the incomprehensible universe, forms my idea of God.