"A scientific truth is not a truth that is true in all possible worlds, but a truth that is true in our world."

"The quantum hypothesis will never make the slightest sense to anyone who cannot accept the existence of a real, objective world independent of our observations."

"The scientist's highest aim is to find the truth."

"My original decision to devote myself to science was a direct result of the discovery, which has never ceased to fill me with enthusiasm, that the laws of nature are accessible to human thought."

"The greatest discovery of all time is that man can change his future by merely changing his attitude."