Many of life's failures are people who did not realize how close they were to success when they gave up.

I never did a day's work in my life. It was all fun.

It is astonishing what an effort it seems to be for many people to put their brains definitely and systematically to work.

If we did all the things we are capable of, we would literally astound ourselves.

One might think that the money value of an invention constitutes its reward to the man who loves his work. But... I continue to find my greatest pleasure, and so my reward, in the work that precedes what the world calls success.

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