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

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

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

Great ideas originate in the muscles.

Reality can be beaten with enough imagination.

Anything you put your mind to and add your imagination into can make your life a lot better and a lot more fun.