"The human mind cannot be content with a description of phenomena; it wants to understand them."

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

"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."

"The positivists have a simple solution: the world must be divided into that which we can say clearly and the rest, which we had better pass over in silence. But can anyone conceive of a more pointless…"

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