When down in the mouth, remember Jonah. He came out all right.

To get a great idea, come up with lots of them.

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

I make more mistakes than anyone else I know, and sooner or later, I patent most of them.

X-rays ... I am afraid of them. I stopped experimenting with them two years ago, when I came near to losing my eyesight and Dally, my assistant practically lost the use of both of his arms.

I am afraid of radium and polonium ... I don't want to monkey with them.

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