Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

I used to think I must be a genius, but nobody's noticed. I used to wonder whether I'm a genius or I'm not, which is it? I used to think, well, I can't be mad, because nobody's put me away, therefore, I'm a genius. A genius is a form of madness, and we're all that way, you know, and I used to be a bit coy about it, like my guitar playing.

Towering genius disdains a beaten path. It seeks regions hitherto unexplored.

Humanitarianism is the expression of stupidity and cowardice.

The limit of man's knowledge in any subject possesses a high interest which is perhaps increased by its close neighbourhood to the realms of imagination.

The promise of this life is imperiled by the very genius that has made it possible.