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<blockquote><a href="http://quotationsbook.com/quote/5538/">Doubt is not a pleasant mental state, but certainty is a ridiculous one.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/7459/">Voltaire</a> on <a href="http://quotationsbook.com/quotes/tag/certainty/">certainty</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>