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<blockquote><a href="http://quotationsbook.com/quote/5512/">One must verify or expel his doubts, and convert them into the certainty of Yes or NO.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/1322/">Carlyle, Thomas</a> on <a href="http://quotationsbook.com/quotes/tag/certainty/">certainty</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>