John D. Rockefeller — "Singleness of purpose is one of the chief essentials for success in life, no mat…"
Singleness of purpose is one of the chief essentials for success in life, no matter what may be one's aim.
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More from John D. Rockefeller
"The greatest enemy of progress is 'good enough.'"
"I never saw a man who could do real work except under the stimulus of encouragement."
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"I have always been afraid of banks."
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