This book moved my to write my very first review. The book starts off with a review of what "happiness" means in a macro sense. There is a discussion of how countries measure happiness if at all. The book really bites when Campbell writes about his own experiences of depression. He gives the most lucid account of how a depressive understands his depression and how it effects his life. He brings out the emptiness of the condition and how it is disconnected from how other people see things. If you suffer from depression (and as you may have guessed, I do) make sure your partner and/or family members read at least this part. They can do it in about 15 minutes. It will give them some idea of what goes on. Campbell explains it better that any academic treatise or autobiography on the topic that I have read has done.