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

"The greatest invention of all time is the human mind."

"Until man duplicates a blade of grass, nature can laugh at his so-called scientific knowledge."

"I have no respect for the man who says he is too busy to read. He is too busy to live."

"I owe my success to the fact that I never had a watch. I never knew what time it was, so I never stopped working."