Marriage from the Heart:
Eight Commitments of a Spiritually Fulfilling Life Together
by Lois Kellerman
Simply the best book on committed relationships that I've found. Unlike too many books that focus on what's wrong with a relationship, Kellerman focuses on how to make a relationship strong by building on strengths.
Every couple -- whether married or not -- can use this book and methodology to build a more fulfilling relationship in which both can grow and change and become more themselves.
This book makes an excellent wedding or anniversary gift for a couple whose relationship is already good -- and who may want to "go deeper."
Marriage from the Heart - from Amazon.com