Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Life Changing Book

If nothing else, this book shows how deeply the human mind can delve into the metaphysical. It is many books in one: A gripping tale, an autobiography, a philosophical treatise. It's one of those books that every time you read it, you glean new and wonderful information. I don't think it's possible to read this book so many times that you've exhausted all it has to offer.