To invent, you need a good imagination and a pile of junk.

I find my greatest pleasure, and so my reward, in the work that precedes what the world calls success.

Time is really the only capital that any human being has, and the only thing he can't afford to lose.

It is apparent to me that the possibilities of the aeroplane, which two or three years ago were thought to hold the solution to the [flying machine] problem, have been exhausted, and that we must turn elsewhere.

Nearly every man who develops an idea works it up to the point where it looks impossible, and then he gets discouraged. That's not the place to become discouraged.

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.

The radio craze will die out in time.