"A theoretical science, if it is to be healthy, must be able to hold its own against the practical application of its theories."

"Quantum mechanics is a wonderful theory. But it is not the last word."

"The only way to do great work is to love what you do."

"This life of yours which you are living is not merely a piece of the entire existence, but is in a certain sense the whole; only this whole is not so constituted that it can be surveyed in a single gl…"

"In fact, I should say that the world is a picture drawn by ourselves, and that we are ourselves part of the picture."