If we ever do find a complete theory of the universe, it would be a great triumph of human reason but it wouldn't leave much for us to do. We need an intellectual challenge.

God not only plays dice, he throws them in the corner where you can't see them.

Although September 11 was horrible, it didn't threaten the survival of the human race, like nuclear weapons do.

When I was first diagnosed with ALS, I was given two years to live. Now 45 years later, I am doing pretty well.

I have so much that I want to do. I hate wasting time.

Observations indicate that the universe is expanding at an ever increasing rate. It will expand forever, getting emptier and darker.

I don't want to write an autobiography because I would become public property with no privacy left.