I have friends in overalls whose friendship I would not swap for the favor of the kings of the world.

I have not failed. I've just found 10,000 foundations and individual donors whose priorities don't align with my organization's.

Nature made us - nature did it all - not the gods of the religions.

Mr. Edison worked endlessly on a problem, using the method of elimination. If a person asked him if he were discouraged because so many attempts proved unavailing, he would say, "No, I am not discouraged, because every wrong attempt discarded is another step forward.".

In creating technology for ourselves we created it for the world.

First, study the present construction. Second, ask for all past experiences ...study and read everything you can on the subject.

I have never seen the slightest scientific proof of the religious ideas of heaven and hell, of future life for individuals, or of a personal God.