The three things that are most essential to achievement are common sense, hard work and stick-to-it-iv-ness.
Thomas A. EdisonI never did anything worth doing entirely by accident. . . Almost none of my inventions came about totally by accident. They were achieved by having trained myself to endure and tolerate hard work.
Thomas A. EdisonThe biggest failure of man is that he gives up before he realizes how close he was to success.
Thomas A. Edison