This short clip from the Rev. Tim Keller, working off an insight from C. S. Lewis, is as good as you’d expect given that combination. He’s right that the contrast you hear from so many preachers between “living God’s way” and “living the world’s way,” or “living according to the Spirit” and “living according to the flesh,” is both wrong—because what many of those preachers are actually calling people to is really just another way of living according to the flesh—and unhelpful—because what non-Christians have learned to expect from such a call, in consequence, is really just another way of living according to the flesh. If we’re going to preach the gospel, we need to start by making it clear to people (both outside the church and within it) that the gospel isn’t what they think it is. Right now, an awful lot of churches are doing a better job of training future atheists than they are of training Christians.
HT: Jared Wilson