I never did anything by accident, nor did any of my inventions come by accident; they came by work.

Many of life's failures are people who did not realize how close they were to success when they gave up.

I am so deaf I am debarred from hearing all the time articulation and have to depend on the judgment of others.

There will one day spring from the brain of science a machine or force so fearful in its potentialities, so absolutely terrifying, that even man, the fighter, who will dare torture and death in order to inflict torture and death, will be appalled, and so abandon war forever.

The first requisite for success is to develop the ability to focus and apply your mental and physical energies to the problem at hand - without growing weary. Because such thinking is often difficult, there seems to be no limit to which some people will go to avoid the effort and labor that is associated with it.

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

I believe in the existence of a Supreme Intelligence pervading the Universe.