How does the peace of Christ rule in our hearts? [Sermon]

"And let the peace of Christ rule in your hearts..." It sounds like a very, very good thing. But what specifically is "the peace of Christ"? What about the reference to our "hearts"? (Clearly, it's not just a muscle in your chest.) And how can that peace "rule"? If this idea is one of the most valuable things in the world which will benefit both us and the people we care about, shouldn't we be clear about what it means? This sermon explores these questions as we unpack Colossians 3:1-17.