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.

If you think you understand it, that only shows that you don't know the first thing about it.

Anyone not shocked by quantum mechanics has not yet understood it.

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

Truth and clarity are complementary.

A person who wasn't outraged on first hearing about quantum theory didn't understand what had been said.

There are some things so serious you have to laugh at them.