[2007] Almost gave this three stars because I felt like it didn't add a lot that was new to the discussion; I've read most of these ideas before - cognitive dissonance, confirmation bias, etc.. But then I remembered that when this book first came out more than ten years ago, it may have been one of the first putting these, now commonly known, concepts out into the layperson's arena. And no matter what, I could read all day about human behavior and why we do the things we do. It's really made me think about what beliefs I should reconsider. What unproductive thoughts, feelings, or actions do I hold onto because they are "just who I am"? On what issues am I perhaps trying to resolve some cognitive dissonance? How much self-justification do I do to avoid admitting I've made a mistake? So hard to see these things in ourselves but this book has motivated me to try.