Sticking to it is the genius.

I never quit until I get what I want.

My main purpose in life is to make money so I can afford to go on creating more inventions.

The First 40 hours of work per week are for survival. Everything after that is for success.

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

There's a way to do it better - find it.

The perils of overwork are slight compared with the dangers of inactivity.