The mind is not a single voice but an argument, a chamber of competing voices, and a [problem] occurs when we listen to the wrong side
If you don't believe this, read one of these books: "Against the Gods, the remarkable story of risk", "How we decide", or "The irrational economist, making decisions in a dangerous world".
Or, you could take a hard look at the papers of Daniel Kahneman and Amos Tversky.
Read in the library at Square Peg Consulting about these books I've written
Buy them at any online book retailer!
Read my contribution to the Flashblog