Business is never as healthy as when, like a chicken, it must do a certain amount of scratching for what it gets.

Improved productivity means less human sweat, not more.

Mr Edison gave America just what was needed at that moment in history. They say that when people think of me, they think of my assembly line. Mr. Edison, you built an assembly line which brought together the genius of invention, science and industry.

Exercise is bunk. If you are healthy, you don't need it: if you are sick you should not take it.

I invented nothing new. I simply assembled the discoveries of other men behind whom were centuries of work. Had I worked fifty or ten or even five years before, I would have failed. So it is with every new thing. Progress happens when all the factors that make for it are ready, and then it is inevitable. To teach that a comparatively few men are responsible for the greatest forward steps of mankind is the worst sort of nonsense.

Writing is the only profession where nobody considers you ridiculous if you earn no money. Money is like an arm or a leg; use it or lose it.

The time will come when man will know even what is going on in the other planets and perhaps be able to visit them.