The stomach is the only part of man which can be fully satisfied. The yearning of man's brain for new knowledge and experience and for more pleasant and comfortable surroundings never can be completely met. It is an appetite which cannot be appeased.

I do not believe any type of religion should ever be introduced into the public schools of the United States.

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.

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

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 have far more respect for the person with a single idea who gets there than for the person with a thousand ideas who does nothing.

Sleep is like a drug. Take too much at a time and it makes you dopey. You lose time and opportunities.