"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,…"

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

"Every word or concept, clear as it may seem to be, has only a limited range of applicability."

"One day, when we have learned to understand the elementary particles, we will have understood the whole world."

"We have to remember that what we observe is not nature in itself but nature exposed to our method of questioning."