"If a man never contradicts himself, the reason must be that he virtually never says anything at all."

"Needless to say, taken literally, this is just as absurd. For an adult organism the energy content is as stationary as the material content. Since, surely, any calorie is worth as much as any other ca…"

"The whole of science is nothing more than a refinement of everyday thinking."

"The greatest change will be in the thinking habits of the human race. It will learn to look at things in a new way. Quantum theory will force it to do so."

"The problem of consciousness is the most difficult problem in science."