I try not to invent things that people don't need.

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 find out what the world needs. Then I go ahead and try to invent it.

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

To invent, you need a good imagination and a pile of junk.

Everyone steals in commerce and industry. I've stolen a lot, myself. But I know how to steal! They don't know how to steal!