"My main purpose in life is to make money so that I can afford to carry on more experiments."

"Show me a thoroughly satisfied man and I will show you failure."

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

"The three great essentials to achieve anything worthwhile are, first, hard work; second, stick-to-itiveness; third, common sense."

"My success is due to the fact that I never went to school and was never forced to learn anything but what I wanted to know."