Success is the product of the severest kind of mental and physical application.

Success is based on imagination plus ambition and the will to work.

Oh these mathematicians make me tired! When you ask them to work out a sum they take a piece of paper, cover it with rows of A's, B's, and X's and Y's ... scatter a mess of flyspecks over them, and then give you an answer that's all wrong!

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

My mother was the making of me.

I never perfected an invention that I did not think about in terms of the service it might give others... I find out what the world needs, then I proceed to invent.

Our greatest weakness lies in giving up.