I spoke in our seminary chapel today on Luke 20:27–38. It is not a profound sermon and may not many qualities of a sermon per se.
My thoughts on this passage were stimulated a year or two ago when a friend of mine, John Makujina, asked me to proof an article that he was writing. That article will appear in the next (?) edition of Filologia Neotestamentaria, “‘Till Death Do Us Part,’ Or the Continuation of Marriage in the Eschaton? Answering Recent Objections to the Traditional Reading of Γαμέω-Γαμίζω in the Synoptic Gospels,” 25 : 57–74. (FN runs well behind, so yes, 2012 is the correct year, though not yet in print that I know.) It’s well worth reading when it is available; quite technical. Another helpful discussion is found in Bock’s BECNT comm. on Luke. Were this an academic paper rather than a sermon, there would be footnotes to both Makujina and Bock.
So, FWIW, here’s a transcript, slightly edited and abridged from the oral presentation.