‘Sometimes people assume that preaching works this way: a preacher prepares a sermon during the week, finishes it at some point – maybe Friday afternoon or Saturday night – and then gets up and preaches the finished product in worship on Sunday. This may be the way it appears on the surface, but experienced preachers know better: sermons are never actually finished. There are always loose ends, questions that could have been pursued in more depth, stones left unturned, intriguing aspects of the biblical text unexamined, thoughts not quite fully baked, an untidiness at the heart of things. At some point, though, preachers have to take what they have, stand up, and speak. Preachers do not preach because the sermon is finished; they preach because it is Sunday. The time has come.
That sermons are never finished is actually a good thing. Sermons get presented in incomplete form not because of procrastination or negligence – not most of the time, anyway – but because preaching mirrors the character of faithful theology and of the Christian life itself. Karl Barth once described God’s revelation as “a bird in flight.” By the time we have paused to snap a photo, write a systematic theology, or craft a sermon, the bird has flown on. “All theology is provisional,” said theologian Arthur C. McGill. “It is the movement … from darkness toward the light, so that as movement no point along its way has permanent or final validity.”’