"I have a theory that the human voice is immortal. It is a form of energy that never dies. It just changes form."

"I owe my success to the fact that I never had a watch or a clock in my laboratory."

"I readily admit that I have been a crank in my life."

"Opportunity is missed by most people because it is dressed in overalls and looks like work."

"I make more mistakes than anyone I know, and sooner or later, I patent them all."