A perfection of means, and confusion of aims, seems to be our main problem.

You cannot simultaneously prevent and prepare for war.

Whoever is careless with the truth in small matters cannot be trusted with important matters.

When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity.

When the solution is simple, God is answering.

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

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

Whoever undertakes to set himself up as a judge of Truth and Knowledge is shipwrecked by the laughter of the gods.

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