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<blockquote><a href="http://quotationsbook.com/quote/11346/">If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/1992/">Descartes, Rene</a> on <a href="http://quotationsbook.com/quotes/tag/doubt/">doubt</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>