Sometimes we talked about the nature of the human soul and about the Cosmic Unity of souls that I had believed in so firmly when I was 15 years old. My mother did not like the phrase Cosmic Unity. It was too pretentious. She preferred to call it a world soul.

That's what I learned from World War II. Things are always more complicated than most people believe.

Things are always more complicated than most people believe.

Do not imagine that you have to know everything before you can do anything. My own best work was done when I was most ignorant.

The pain of childbirth is not remembered. It's the child that's remembered.

The reason why new concepts in any branch of science are hard to grasp is always the same; contemporary scientists try to picture the new concept in terms of ideas which existed before.

Technology must be guided and driven by ethics if it is to do more than provide new toys for the rich.