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<blockquote><a href="http://quotationsbook.com/quote/29864/">All excellent things are as difficult as they are rare.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/6885/">Spinoza, Baruch (Benedict de)</a> on <a href="http://quotationsbook.com/quotes/tag/perfection/">perfection</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>