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

"The history of physics is not only a sequence of experimental discoveries and observations, but also a history of concepts."

"The physical world is not real in the sense that it exists independently of our observing it."

"The smallest units of matter are not physical objects in the ordinary sense; they are forms, structures or—in Plato's sense—Ideas."

"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…"

"One cannot be a physicist without feeling that a religious element is present in the world."