"If a man is to be a good physicist, he must have an intuitive grasp of the physical reality, which can be acquired only by much experience."

"The atoms or elementary particles themselves are not real; they form a world of potentialities or possibilities rather than one of things or facts."

"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."

"The decision to break with the tradition of classical physics was a very difficult one."

"The concept of the objective reality of the elementary particles has thus evaporated not into the fog of some new, unclear, or not yet understood reality concept, but into the transparent clarity of a…"