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

The first requisite for success is the ability to apply your physical and mental energies to one problem incessantly without growing weary.

We are like tenant farmers chopping down the fence around our house for fuel when we should be using Nature’s inexhaustible sources of energy — sun, wind and tide. I’d put my money on the sun and solar energy. What a source of power! I hope we don’t have to wait until oil and coal run out before we tackle that.

I am proud of the fact that I never invented weapons to kill.