"Neither Dirac nor von Neumann discussed his measurements in physical terms."

“In fact, there really is not a new law of nature. It was all in the theory to begin with but nobody worked it out.”

“At the first of the 1960's Rochester Coherence Conferences, I suggested that a license be required for use of the word photon, and offered to give such license to properly qualified people.”

“I liked quantum mechanics very much. The subject was hard to understand but easy to apply to a large number of interesting problems.”

“In his 1930 book, Dirac took for granted that measurements could be made, but was very vague about what was actually involved.”