It's easier to live in harmony when you know yourself and the person you're living with. Not "know" as in, "Why, hi, I'm Bob, glad to know you, want to live with me?" But more like "know" as in you've spent quality time and effort to figure out how you and your partner think (process information) and react to a wide range of (often unobvious) challenges. Most of this book offers things to think/talk about that may not have occurred to you. That's because we're usually blind to the ways we've been brought up; we don't often think about how we think and we don't often challenge our own beliefs....