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<blockquote><a href="http://quotationsbook.com/quote/7790/">Concentration and mental toughness are the margins of victory.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/6328/">Russell, Bill</a> on <a href="http://quotationsbook.com/quotes/tag/concentration/">concentration</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>