"An expert is someone who knows some of the worst mistakes that can be made in his subject and how to avoid them."

"The meaning of 'understanding' has changed in the course of the development of physics."

"The more I think about the physical aspects of the electron, the more it becomes a puzzle."

"The decision for a definite result is taken only when the measurement is made."

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