If I had only known, I would have been a locksmith.

My sailing system set sail, make it fast, no thoughts of energy or velocity, loll back, let boat drift.

Since the mathematicians have invaded the theory of relativity I do not understand it myself any more.

I know that it is a hopeless undertaking to debate about fundamental value judgements. For instance, if someone approves, as a goal, the extirpation of the human race from the earth, one cannot refute such a viewpoint on rational grounds. But if there is agreement on certain goals and values, one can argue rationally about the means by which these objectives may be obtained.

Memory is deceptive because it is colored by today's events.

When forced to summarize the general theory of relativity in one sentence: Time and space and gravitation have no separate existence from matter.

That deep emotional conviction of the presence of a superior reasoning power, which is revealed in the incomprehensible universe, forms my idea of God.