David Wells, in his new book The Courage to be Protestant:
“Preaching is not a conversation about some interesting ideas. It is not the moment in which postmoderns hear their own private message in the biblical words, one unique to each one who hears, and then go their own way. No! This is God speaking! He speaks through the stammering lips of the preacher where that preacher’s mind is on the text of Scripture and his heart is in the presence of God. God, as Luther puts it, lives in the preacher’s mouth.
This is the kind of preaching that issues a summons, which nourishes the soul, which draws the congregation into the very presence of God so that no matter what aspect of his character, his truth, his working in this world is in focus, we leave with awe, gratitude, encouragement, and sometimes a rebuke. We have been in the very presence of God! This is what great preaching always does.”
(David Wells; The Courage to be Protestant; p 230)