Everything we call real is made of things that cannot be regarded as real.

The best weapon of a dictatorship is secrecy, but the best weapon of a democracy should be the weapon of openness.

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.

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

If you aren't confused by quantum mechanics, you haven't really understood 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.