When I'm judging a theory, I ask myself whether, if I were God, I would have arranged the world in such a way.
You ask me if I keep a notebook to record my great ideas. I've only ever had one.
Relativity teaches us the connection between the different descriptions of one and the same reality.
Imagination is vastly more important than intelligence.
Life is like riding a bicycle. To keep your balance, you must keep moving.
If I would be a young man again and had to decide how to make my living, I would not try to become a scientist or scholar or teacher. I would rather choose to be a plumber or a peddler in hope to find that modest degree of independence still available under present circumstances.