Werner Heisenberg — "The path to the nucleus is easy to find, but the nucleus itself is hard to reach…"

"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."

"I was very much afraid of the consequences of the atom bomb, and I tried to delay its development."

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

"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…"

"I would say that I was absolutely convinced of the possibility of our making a uranium engine. but I never thought that we would make a bomb. and at the bottom of my heart. I was really glad that it w…"