Never lose a holy curiosity. Try not to become a man of success but rather try to become a man of value. He is considered successful in our day who gets more out of life than he puts in. But a man of value will give more than he receives.

The environment is everything that isn't me.

It is only to the individual that a soul is given.

The whole of science is nothing more than a refinement of everyday thinking.

Never let yourself be seduced by any problem, no matter how difficult.

The ordinary adult never gives a thought to space-time problems ... I, on the contrary, developed so slowly that I did not begin to wonder about space and time until I was an adult. I then delved more deeply into the problem than any other adult or child would have done.

Men marry women with the hope they will never change. Women marry men with the hope they will change. Invariably they are both disappointed.