Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This book is his best so far lets see what comes next.

I have read a lot of Arnold's books and they are all very powerful but this is the best one yet. It causes you to think of where prayer is in ones own life. And encourages you to go deeper in your persuit of prayer. Arnold uses the wisdom of many people to illustrate a point. Everyone should read this book.