Any preacher can read Nistingen's analysis to his or her benefit, and any sermon-hearer can benefit from the preparation for the season, too. One snippet to whet your appetite:
[With respect to Mt. 3:1-12, Advent III:] Repentance is a correlate of freedom. The tearing away that takes places in detachment is only possible because a deeper, more powerful and superior attachment has come: the attachment of faith, the grip of the kingdom. ... Jesus' repentance is a reflex of the gospel, a detachment that is the result of his attachment to us in grace. (pp. 409, 410)
To which I can only say, "Amen." Follow the link; it's a good article -- and a sermon in its own right (as all good theology is!).
And my thanks to Paul, my brother in the faith, who insists on trying to make me eat every word in which I contradict or criticize his mentors -- with more or less success, I note!