"The more deeply we penetrate into nature, the more we find that it is full of mysteries."

"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…"

"What is life? The answer to this question is not what one expects."

"The quantum theory is an 'unpleasant' theory, which I should have liked to assume to be true only if I were forced to do so by the facts."

"By the way, I never realized that to be nonbelieving, to be an atheist, was a thing to be proud of. It went without saying as it were."