Sin and Grace

I recently finished Dave Harvey's fantastic book When Sinners Say "I Do". While the book is clearly written to benefit married couples, there is no doubt that anyone could benefit from the wisdom of this book in everyday relationships. Why? I think Paul David Tripp says it best in the foreword of the book:

This book grasps the core drama of every married couple [and humanity]. This drama is no respecter of race, ethnic origin, location, or period of history. It is the one thing that explains the doom and hope of every human relationship. It is the theme that is on every page of this book in some way. What is this drama? It is the drama of sin and grace.