I believe my theory of relativity to be true. But it will only be proved for certain in 1981, when I am dead.

History is littered with examples of men who would become gods, but only one example of God becoming Man.

There is nothing divine about morality; it is a purely human affair. If people are good only because they fear punishment, and hope for reward, then we are a sorry lot indeed. What the individual can do is to give a fine example, and to have the courage to uphold ethical values .. in a society of cynics.

The most beautiful gift of nature is that it gives one pleasure to look around and try to comprehend what we see.

I have little patience with scientists who take a board of wood, look for its thinnest part, and drill a great number of holes where drilling is easy.

It's not that I'm so smart.

What is essential in the life of a man of my kind is what he thinks and how he thinks, and not what he does or suffers.