Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Modern repackaging of an old "law" that has still to be proven effective

The book is a modern version of the famous Law of Attraction. This may work for some people some times, for reasons that have not been well studied in fields other than psychology, but I have yet to see a single published research to prove that it works most of the times, for most of the people. So it resembles more of a religion/sect than a "law of the universe"...It surely attracts a lot of attention since it sells hope that many people today desperately need and seek anywhere. Sorry to disappoint you, but the truth is out there and not in this book!There are numerous techniques to get yourself motivated and if you use this book as one, and only for that, then your money may be well spent. However, don't take it too serious so you don't have to face dissapointment if nothing happens in the end as you've dreamed of, because this will leave you in a much worse state than before reading the book!