I start where the last man left off.

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

Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.

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.

My main purpose in life is to make money so I can afford to go on creating more inventions.

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