Chris Erdman made this great statement about how the role of preachers functions within a missional community. I love it!
“…Our words [as preachers], formed by the Word, form communities that “explain the gospel” by the way they live. Missional communities. They make sense only if this gospel is true and is truly having its way among them…”
Missional communities explain the good news of God’s kingdom in Christ by how they live! Words are not usually necessary if the missional community is living appropriately. Paul Fromont then quotes Lesslie Newbigin:
“The church is the primary hermeneutic of the gospel centred on Jesus Christ”
God, I wish I lived like this…
Journeying Home 
Where we fall down is in John 17, where Jesus prayed, “I do not ask on behalf of these alone, but for those also who (will come to) believe in Me through their word; that they may all be one; even as You, Father, (are) in Me and I in You, that they also may be in Us, so that the world may believe that You sent Me.”
Unity, or the lack of it, is why the world isn’t changed by the church. By and large, we’re quite unconvincing models of Love.
Good topic.