I think good preachers should be like bad kids. They ought to be naughty enough to tiptoe up on dozing congregations, steal their bottles of religion pills…and flush them all down the drain. The church, by and large, has drugged itself into thinking that proper human behavior is the key to its relationship with God. What preachers need to do is force it to go cold turkey with nothing but the word of the cross–and then be brave enough to stick around while [the congregation] goes through the inevitable withdrawal symptoms. But preachers can’t be that naughty or brave unless they’re free from their own need for the dope of acceptance. And they wont be free of their need until they can trust the God who has already accepted them, in advance and dead as door-nails, in Jesus. Ergo, the absolute indispensability of trust in Jesus’ passion. Unless the faith of preachers is in that alone–and not in any other person, ecclesiastical institution, theological system, moral prescription, or master recipe for human loveliness–they will be of very little use in the pulpit.
From “The Foolishness of Preaching: Proclaiming the Gospel Against the Wisdom of the World”