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<blockquote><a href="http://quotationsbook.com/quote/22135/">Knowledge has to be improved, challenged, and increased constantly, or it vanishes.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/2132/">Drucker, Peter F.</a> on <a href="http://quotationsbook.com/quotes/tag/knowledge/">knowledge</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>