"I am not a scientist. I am an inventor."

"We will make electricity so cheap that only the rich will burn candles."

"Genius is one percent inspiration and ninety-nine percent perspiration."

"I never did anything worth doing by accident, nor did any of my inventions come by accident; they came by work."

"I never had a bad break in my life. I have had a lot of hard ones, but never a bad one."