"The kingdom of heaven is like... The kingdom of heaven is like... The kingdom of heaven is like..." so says Jesus. I wonder if we modern folks wouldn't have gotten frustrated very quickly with Jesus. "Don't tell us what the kingdom is like! What is it?"
The psalm appointed for Sunday, despite my reservations expressed on Monday, is quite a piece of liturgical theology. If you look it up in your handy-dandy study Bible (rather than the BCP), you’ll find that it is given both a title and a style heading.