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

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

"We wouldn't have had the moral courage to recommend to the government in the spring of 1942 that they should employ 120,000 men just for building the thing up."

"In the history of science, it has often happened that a new discovery had to be rejected for a long time because it contradicted the current prejudices."

"The more profound the knowledge, the more clear is the awareness of the limits of our knowledge."

"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…"