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

If we did all the things we are capable of, we would literally astound ourselves.

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

I never did anything by accident, nor did any of my inventions come by accident; they came by work.

The value of an idea lies in the using of it.

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