I owe my success to the fact that I never had a clock in my workroom.

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 both pleased but astonished by the fact that mankind has not yet begun to use all the means and devices that are available for destruction. I hope that such weapons are never manufactured in quantity.

There is time for everything.

Genius? Nothing! Sticking to it is the genius! Any other bright-minded fellow can accomplish just as much if he will stick like hell and remember nothing that's any good works by itself. You've got to make the damn thing work!...I failed my way to success.

Five percent of the people think; ten percent of the people think they think; and the other eighty-five percent would rather die than think.

I have not failed 10,000 times. I have succeeded in proving that those 10,000 ways will not work.