It seems sensible to discard all hope of observing hitherto unobservable quantities, such as the position and period of the electron... Instead it seems more reasonable to try to establish a theoretical quantum mechanics, analogous to classical mechanics, but in which only relations between observable quantities occur.

Nonsense. Space is blue and birds fly through it.

The problems of language here are really serious. We wish to speak in some way about the structure of the atoms. But we cannot speak about atoms in ordinary language.

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

It is probably true quite generally that in the history of human thinking the most fruitful developments frequently take place at those points where two different lines of thought meet.

My mind was formed by studying philosophy, Plato and that sort of thing.

Only a few know, how much one must know to know how little one knows.