johnlawrenceaspden comments on Rationality Quotes June 2014 - Less Wrong
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It ain't what we don't know that causes trouble, it's what we know that just ain't so.
David Deutsch, claiming the authority of an "unknown sage" http://www.theguardian.com/science/2012/oct/03/philosophy-artificial-intelligence
Usually attributed to Mark Twain.
David Deutsch is right - it doesn't appear in Twain, and it's difficult to find any good citation for the true originator.