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<blockquote><a href="http://quotationsbook.com/quote/7788/">Singleness of purpose is one of the chief essentials for success in life, no matter what may be one's aim.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/6188/">Rockefeller, John D.</a> on <a href="http://quotationsbook.com/quotes/tag/concentration/">concentration</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>