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<blockquote><a href="http://quotationsbook.com/quote/19718/">Humanity has advanced, when it has advanced, not because it has been sober, responsible, and cautious, but because it has been playful, rebellious, and immature.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/6157/">Robbins, Tom</a> on <a href="http://quotationsbook.com/quotes/tag/humankind/">humankind</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>