Book excerpt: Tammy and Ed Sloan have been married for over two decades when they suddenly discover themselves on opposite sides of a current social issue -- gay rights. Soon, they are horrified to discover that their differences run much deeper. the Door of the Heart is a story of being true to oneself, of marriage and commitment, and of individual responses to change; but in a broader sense, it is a story about how polarization limits the emotional and spiritual growth of individuals and destroys every aspect of community.