"We have to remember that what we observe is not nature in itself but nature exposed to our method of questioning."

"I am firmly convinced that we must never judge political movements by their aims, no matter how loudly proclaimed or how sincerely upheld, but only by the means they use to realize these aims."

"Quantum theory does not really describe the behavior of 'things'; it describes the behavior of 'what we can know' about things."

"Can nature possibly be so absurd as it seemed to us in these atomic experiments?"

"The problems of language here are really serious. We wish to speak in some way about the structure of the atoms. But we cannot speak about atoms in ordinary language."