Werner Heisenberg — "The meaning of 'understanding' has changed in the course of the development of p…"

"If we want to describe what happens in an atomic event, we must realize that the word 'happens' can apply only to the observation, not to the state of affairs between two observations."

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

"Science is rooted in conversations."

"I remember discussions with Bohr which went through many hours till very late at night and ended almost in despair; and when at the end of the discussion I went alone for a walk in the neighboring par…"

"It is not surprising that our language should be incapable of describing the processes occurring within the atoms, for, as has been remarked, it was invented to describe the experiences of daily life,…"