Imagination is vastly more important than intelligence.

Science without religion is lame, religion without science is blind.

Conventional words or other signs have to be sought for laboriously only in a second stage, where the associative play already referred to is sufficiently established and can be reproduced at will.

People like us, who believe in physics, know that the distinction between past, present, and future is only a stubbornly persistent illusion.

... we will hope that future historians will explain the morbid symptoms of present-day society as the childhood ailments of an aspiring humanity, due entirely to the excessive speed at which civilization was advancing.

The most important thing is to not stop questioning.

I do know that kind fate allowed me to find a couple of nice ideas after many years of feverish labor.