Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Read The Celestine Prophecy and The Tenth Insight First

Although this book is as enjoyable as the first two, I wouldn't suggest reading it without having read The Celestine Prophecy and the Tenth Insight first. Otherwise, I think it will be very difficult to follow the book. Combined with the other two, they are an excellent set; and as a set, I would rate them a 5.