Not only is the Universe stranger than we think, it is stranger than we can think.

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

Can quantum mechanics represent the fact that an electron finds itself approximately in a given place and that it moves approximately with a given velocity, and can we make these approximations so close that they do not cause experimental difficulties?

It will never be possible by pure reason to arrive at some absolute truth.

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.