You ask: what is the meaning or purpose of life? I can only answer with another question: do you think we are wise enough to read God's mind?

We have no reason to think that climate change is harmful if you look at the world as a whole. Most places, in fact, are better off being warmer than being colder. And historically, the really bad times for the environment and for people have been the cold periods rather than the warm periods.

We won't really understand the brain until we can make models of it which are analog rather than digital, which nobody seems to be trying very much.

For me, science is just a bunch of tools - it's like playing the violin. I just enjoy calculating, and it's an instrument I know how to play. It's almost an athletic performance, in a way. I was just watching the Olympics, and that's how I feel when proving a theorem.

The pain of childbirth is not remembered. It's the child that's remembered.

Most of the papers which are submitted to the Physical Review are rejected, not because it is impossible to understand them, but because it is possible. Those which are impossible to understand are usually published.

It is characteristic of all deep human problems that they are not to be approached without some humor and some bewilderment.