This is a lecture that I use for a course I teach at NNU. I like it because Michael Frost does a nice job using some very vivid images to help us re-think what the church is supposed to be about.
If you are unfamiliar with Michael Frost, he is an Australian professor and missiologist. He has written several books that have become very popular among pastors and leaders who are trying to re-imagine church for the post-Christian era. My favorite book of his, and one that I use in a class I teach is - "The Shaping of Things to Come."