"The more you know, the more you realize you don't know."

"The atomic age is a new age, and we must learn to live in it."

"The greatest tragedy of science is the slaying of a beautiful hypothesis by an ugly fact."

"The fundamental problem is that the world is not simple. It is complex, and we are trying to understand it with simple ideas."

"I have never been interested in making money. I have always been interested in doing physics."