The three great essentials to achieve anything worth while are: Hard work, Stick-to-itiveness, and Common sense.
Thomas A. Edison

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Other quotes by Thomas A. Edison

To invent, you need a good imagination and a pile of junk.

The best thinking has been done in solitude. The worst has been done in turmoil.

I have friends in overalls whose friendship I would not swap for the favor of the kings of the world.

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

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