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<blockquote><a href="http://quotationsbook.com/quote/11352/">Doubt is the father of invention.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/2707/">Galilei, Galileo</a> on <a href="http://quotationsbook.com/quotes/tag/doubt/">doubt</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>