The author admits this ecclesiology of communion is an ideal vision, and it certainly is. But this idealism is warranted in the desire and efforts toward the visible unity of the church, and the idea that such unity would need to grow from the bottom up is not pie in the sky. From local congregations becoming unified within their own communities, to cross-denomination unity growing in local geographic contexts, and out from there with the ultimate goal of full sharing of the Eucharist across current church divides...it is a big vision. But church unity stands at the center of what the church is and what the church is called to, as we are both constituted by the gospel of Christ and called to witness to it in the world. If we think that church unity is incidental to what the church is as Christ's body or incidental to our mission, then we have failed to comprehend much of the NT teaching on the nature of the church as a body of many members connected to Christ-the-head, or as many branches connected to the vine which is Christ, and we have failed to recognize the importance of Jesus' prayer that the church may be one so that the world would know that the Father sent the Son for its salvation. No matter where one stands on the issue of ecumenical discussion or church unity debates, this book ought to be read and its theology and implications dealt with seriously. For Christians to confess every Sunday that we believer in "one, holy, catholic and apostolic church," and then think that the church's oneness, holiness, and catholicity doesn't matter, or that the instructions the apostles gave regarding her unity are peripheral, is inconsistent, to put it mildly. My personal application from this book (not one the author speaks to specifically): cultivate friendships with Christians of many and varied traditions, and do so by extending hospitality to them through a meal around our table in our home, in the hope that shared meals will 'prime the pump' of a future joining around the Eucharistic table.