No man is rich who is unsatisfied, but who wants nothing possess his heart's desire.

Know your place in the world and evaluate yourself fairly, not in terms of the naïve ideals of your own youth, nor in terms of what you erroneously imagine your teacher's ideals are.

Mathematics is not just a language. Mathematics is a language plus reasoning.

Know how to solve every problem that has been solved.

There's plenty of room at the bottom.

A poet once said, "The whole universe is in a glass of wine." We will probably never know in what sense he meant that, for poets do not write to be understood. But it is true that if we look at a glass of wine closely enough we see the entire universe.

I learned very early the difference between knowing the name of something and knowing something.