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<blockquote><a href="http://quotationsbook.com/quote/28882/">The man who is a pessimist before 48 knows too much; if he is an optimist after it, he knows too little.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/7349/">Twain, Mark</a> on <a href="http://quotationsbook.com/quotes/tag/optimism/">optimism</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>