No paradox, no progress.

The opposite of every great idea is another great idea.

No paradox, no progress.

If anybody says he can think about quantum physics without getting giddy, that only shows he has not understood the first thing about them.

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.

It is, indeed, perhaps the greatest prospect of humanistic studies to contribute through an increasing knowledge of the history of cultural development to that gradual removal of prejudices which is the common aim of all science.

Those who are not shocked when they first come across quantum theory cannot possibly have understood it.