"Thermodynamics is a funny subject. The first time you go through it, you don't understand it at all. The second time you go through it, you think you understand it, except for one or two small points.…"

"No burden is so heavy for a man to bear as a succession of happy days."

"The quantum hypothesis will never be understood until one realizes that it is only a provisional stopgap."

"The most important task of science is to liberate man from the illusion that he is the center of the world."

"The true scientist is a man who is always asking questions, and never satisfied with the answers."