Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Naive

I picked up this book with great expectations. I have usually found the other readers' rating system on Amazon to be quite accurate, but this book was a complete disappointment. It felt disjointed, naive and lacking in proper content to warrant a full book on the matter.Basically, the book can be boiled down to two pieces of advice on which optimism depends. These are downward comparison and controlling our inner environment. I find it hard to believe this book will be of real practical benefit to most readers. You have been warned.