If you don't make mistakes, you're not working on hard enough problems. And that's a big mistake.

When religion talks about our aspirations and our sense of morality, I do not believe that science can contradict it. However, when religion contradicts science on matters of fact, religion must yield.

An ordinary mistake is one that leads to a dead end, while a profound mistake is one that leads to progress. Anyone can make an ordinary mistake, but it takes a genius to make a profound mistake.

In physics, you don't have to go around making trouble for yourself - nature does it for you.

Why is there something rather than nothing?

I'm convinced that art and science activate the same parts of the brain.

Many of my heroes, like Galileo, Maxwell, Newton and, less explicitly, Einstein thought what they were doing was finding out what God is. All of them had this inspiration that if you want to find out what God is, you have to look at his work.