I do not play games. There is not time for it. When I get through with work, I don't want anything that requires the working of the mind.

Only a monomaniac gets anything done.

I once thought that if I could ask God one question, I would ask how the universe began, because once I knew that, all the rest is simply equations. But as I got older I became less concerned with how the universe began. Rather, I would want to know why he started the universe. For once I knew that answer, then I would know the purpose of my own life.

Creating a new theory is not like destroying an old barn and erecting a skyscraper in its place. It is rather like climbing a mountain, gaining new and wider views, discovering unexpected connections between our starting points and its rich environment. But the point from which we started out still exists and can be seen, although it appears smaller and forms a tiny part of our broad view gained by the mastery of the obstacles on our adventurous way up.

The only real valuable thing is intuition. The intellect has little to do on the road to discovery

For an idea which, at first, does not seem absurd, there is no hope.

To the extent math refers to reality, we are not certain to the extent we are certain, math does not refer to reality.