Thomas Alva Edison

Genius is one percent inspiration, ninety-nine percent perspiration.

I have not failed. I've just found 10,000 ways that won't work.

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

There is no substitute for hard work.

Our greatest weakness lies in giving up.

The three great essentials to achieve anything worthwhile are: hard work, stick-to-itiveness, and common sense.

I never did a day's work in my life. It was all fun.