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

I never did anything worth doing entirely by accident. . . Almost none of my inventions came about totally by accident. They were achieved by having trained myself to endure and tolerate hard work.

The inventor tries to meet the demand of a crazy civilization.

Remember, life is all what you focus on. Learn lessons and keep moving forward towards your goals and dreams... "I have not failed. I've just found 10,000 ways that won't work."

I never view mistakes as failures. They are simply opportunities to find out what doesn't work.

We don't know a millionth of one percent about anything.

Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.