“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.”

The chief function of the body is to carry the brain around.

Be courageous! Have faith! Go forward.

I never quit until I get what I want.

Genius is not inspired. Inspiration is perspiration.

The value of an idea lies in the using of it.

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

There seems to be no limit to which some men will go to avoid the labor of thinking. Thinking is hard work.

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

Time is really the only capital that any human being has, and the only thing he can’t afford to lose.

Great ideas originate in the muscles.

There is no expedient to which a man will not go to avoid the real labor of thinking.

Continued innovation is the best way to beat the competition.

Everything comes to him who hustles while he waits.

I have friends in overalls whose friendship I would not swap for the favor of the kings of the world.

I start where the last man left off.

I am 67, but I’m not too old to make a fresh start.