This book is my favorite non-fiction book. It is hard to reduce it back to what it is about, but it is filled with very useful insight into how the mind works. The metaphor of the rider and the elephant finally let me explain differences between what I consciously decided and what I actually did.
It's a metaphor he also puts to good use in his later book, the Righteous Mind. It's useful to seeing through your own righteousness and recognizing patterns in others. I enjoyed that one too, but it didn't have the same life impact as the Happiness Hypothesis.
