Werner Heisenberg — "Modern physics has, in a certain sense, revived Plato's philosophy of forms in t…"

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

"The path to the new physics was paved by the discovery of the quantum of action."

"The more precise the measurement of position, the more imprecise the measurement of momentum, and vice versa."

"The idea of an objective real world whose smallest parts exist objectively in the same sense as stones or trees exist, independently of whether or not we observe them... is impossible."

"There are things that are so serious that you can only joke about them."