Be courageous! Have faith! Go forward.

I never once failed at making a light bulb. I just found out 99 ways not to make one.

Invention is 1% inspiration and 99% perspiration

The three things that are most essential to achievement are common sense, hard work and stick-to-it-iv-ness.

The reason a lot of people do not recognize opportunity is because it usually goes around wearing overalls looking like hard work.

Unfortunately, there seems to be far more opportunity out there than ability.... We should remember that good fortune often happens when opportunity meets with preparation.

The biggest failure of man is that he gives up before he realizes how close he was to success.