There are children playing in the street who could solve some of my top problems in physics, because they have modes of sensory perception that I lost long ago."

The true scientist never loses the faculty of amusement. It is the essence of his being.

"When you see something that is technically sweet, you go ahead and do it and you argue about what to do about it only after you have had your technical success. That is the way it was with the atomic bomb."

A man whose errors take ten years to correct is quite a man.

The atomic bomb ... made the prospect of future war unendurable. It has led us up those last few steps to the mountain pass; and beyond there is a different country.