My rule is, when you are unhappy, think about it. But when you're happy, don't. Why spoil it? You're probably happy for some ridiculous reason and you'd just spoil it to know it.

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

To guess what to keep and what to throw away takes considerable skill. Actually it is probably merely a matter of luck, but it looks as if it takes considerable skill.

Don't worry about anything. Go out and have a good time.

Some things that satisfy the rules of algebra can be interesting to mathematicians even though they don't always represent a real situation.

The work I have done has, already, been adequately rewarded and recognized. Imagination reaches out repeatedly trying to achieve some higher level of understanding, until suddenly I find myself momentarily alone before one new corner of nature's pattern of beauty and true majesty revealed. That was my reward.

Science is what we do to keep us from lying to ourselves