Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great book on the importance of marriage

This is one of the best books I've read about the importance of marriage. This book doesn't give tips on how to improve your marriage, but talks about how marriage is necessary for individuals, families and for society. It also talks about the declining birth rates and the problems that is causing. I would HIGHLY recommend this book to anyone wanting to learn more on how marriages are important.