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<blockquote><a href="http://quotationsbook.com/quote/11106/">If necessity is the mother of invention, discontent is the father of progress.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/6190/">Rockerfeller, David</a> on <a href="http://quotationsbook.com/quotes/tag/discontent/">discontent</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>