"Singleness of purpose is one of the chief essentials in life, no matter what may be one's aim."
John D. Rockefeller (1839 - 1937)
John Davison Rockefeller, Sr. was an American business magnate and philanthropist. He was a co-founder of the Standard Oil Company, which dominated the oil industry and was the first great U.S. business trust. Wikipedia
To learn more http://en.wikipedia.org/wiki/John_D._Rockefeller
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