If people are good because they fear punishment, and hope for reward, then we are a sorry lot indeed.

Only in mathematics and physics was I, through self-study, far beyond the school curriculum, and also with regard to philosophy as it was taught in the school curriculum.

What you can't imagine, you can't discover.

There will come a point in everyone's life , however, where only intuition can make the leap ahead, without ever knowing precisely how. One can never know why but one must accept intuition as a fact.

I regard class differences as contrary to justice and, in the last resort, based on force.

Understanding physics is child's play when compared to understanding child's play.

I do not play games. There is not time for it. When I get through with work, I don't want anything that requires the working of the mind.