For any speculation which does not at first glance look crazy, there is no hope.

Do not imagine that you have to know everything before you can do anything. My own best work was done when I was most ignorant.

People who travel in China tell me that the mood there is still very upbeat, because their media is different from our media. Chinese media emphasize how well things are going and suppress the bad news and publish the good news.

Technology must be guided and driven by ethics if it is to do more than provide new toys for the rich.

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.

That's what I learned from World War II. Things are always more complicated than most people believe.

The science window gives you a view of the world, and the religion window gives you a totally different view. You can't look at both of them at the same time, but they're both true.