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<blockquote><a href="http://quotationsbook.com/quote/5519/">The one unchangeable certainty is that nothing is unchangeable or certain.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/3997/">Kennedy, John F.</a> on <a href="http://quotationsbook.com/quotes/tag/certainty/">certainty</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>