Physics is the belief that a simple and consistent description of nature is possible.

And anyone who thinks they can talk about quantum theory without feeling dizzy hasn't yet understood the first thing about it.

Anyone who can contemplate quantum mechanics without getting dizzy hasn't understood it.

When it comes to atoms, language can be used only as in poetry. The poet, too, is not nearly so concerned with describing facts as with creating images and establishing mental connections.

The present state of atomic theory is characterized by the fact that we not only believe the existence of atoms to be proved beyond a doubt, but also we even believe that we have an intimate knowledge of the constituents of the individual atoms.

An expert is a man who has made all the mistakes which can be made, in a narrow field.

One must always do what one really cannot.