When the problem [quantum chromodynamics] is finally solved, it will all be by imagination. Then there will be some big thing about the great way it was done. But it's simple -it will all be by imagination, and persistence.

Today's brains are yesterday's mashed potatoes.

We need to teach how doubt is not to be feared but welcomed. It's OK to say, "I don't know."

Doubt is clearly a value in science. It is important to doubt and that the doubt is not a fearful thing, but a thing of great value.

The world is a dynamic mess of jiggling things

Physics is not the most important thing. Love is.

The basis of action on love, the brotherhood of all men, the value of the individual... the humility of the spirit.