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<blockquote><a href="http://quotationsbook.com/quote/19639/">[Three classes of people]: Those who see. Those who see when they are shown. Those who do not see.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/1835/">Da Vinci, Leonardo</a> on <a href="http://quotationsbook.com/quotes/tag/humankind/">humankind</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>