Shake and shake the ketchup bottle
None'll come, and then a lott'll.
Historically, the sermon is actually a fairly late addition to Eucharistic worship. The sermon was of course a common enough literary genre, but most of the famous sermon collections of the Middle Ages—those of Augustine, Caesarius of Arles, or even Bernard of Clairvaux in the twelfth century--were perhaps never actually preached. They were instead passed around in manuscript for pious reading in religious houses. They were like “closet” drama.