My mind is incapable of conceiving such a thing as a soul. I may be in error, and man may have a soul; but I simply do not believe it.

Oh these mathematicians make me tired! When you ask them to work out a sum they take a piece of paper, cover it with rows of A's, B's, and X's and Y's ... scatter a mess of flyspecks over them, and then give you an answer that's all wrong!

Sticking to it is the genius.

Not only will atomic power be released, but someday we will harness the rise and fall of the tides and imprison the rays of the sun.

We will make electricity so cheap that only the rich will burn candles.

I did not fail two thousand times. I merely found two thousand ways not to make a lightbulb.

The endeavor to change universal power by selfish supplication I do not believe in.