Alright, can we just accept that Jesus is saying to much this one Sunday for any one sermon? In the readings selected from Matthew 13, Jesus gives us six different statements about the kingdom. We call them "parables" because Matthew himself calls them "parables," but you could argue that none of them is more than a simile. Still, here's what we have.
The parables about the mustard seed and the leaven seem to suggest that the kingdom starts small and then grows beyond measure. Sounds easy enough. I could preach on that.
The parables about the field and the pearl seem to suggest that the kingdom is of incomparable value, requiring total dedication from us. Sounds ok. Again, there's a sermon to be preached there.
The parable about the net and the catch of fish is basically a restatement of the parable of the wheat and weeds from last Sunday, and it seems to suggest that God alone sorts out the good and the bad when it comes to the kingdom. I could preach on that, too, but didn't we just hear that sermon?
Lastly, Jesus says that the scribes in the kingdom are like a master who brings out both old a new treasure, which (after a lot of study and reading of secondary sources) seems to suggest that the kingdom of God is about both old dispensations and new revelations--the traditional Jewish understandings and the new spin that Jesus puts on them. I could preach on that--and probably will--but why all the other stuff?
How does one preach a sermon on the growth of a kingdom of incomparable value that is populated by those whom God alone chooses, all of which is revealed in old a new understandings? Easy enough? Hope you have a late tee time on Sunday.