I consider Paine our greatest political thinker. As we have not advanced, and perhaps never shall advance, beyond the Declaration and Constitution, so Paine has had no successors who extended his principles.

Negative results are just what I want. They’re just as valuable to me as positive results. I can never find the thing that does the job best until I find the ones that don’t.

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.

My mother was the making of me. She was so true and so sure of me, I felt that I had someone to live for - someone I must not disappoint. The memory of my mother will always be a blessing to me.

There is no substitute for hard work.

There seems to be no limit to which some men will go to avoid the labor of thinking. Thinking is hard work.

Focus on how the end-user customers perceive the impact of your innovation - rather than on how you, the innovators, perceive it.