A man should look for what is, and not for what he thinks should be.

Without deep reflection one knows from daily life that one exists for other people.

You ask me if I keep a notebook to record my great ideas. I've only ever had one.

When the solution is simple, God is answering.

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.

Nationalism is an infantile sickness. It is the measles of the human race.

You cannot simultaneously prevent and prepare for war.

You can never solve a problem on the level on which it was created.

Reality is merely an illusion, albeit a very persistent one.