OK, I’ve finally hit on it.

Even though it’s explained, I think there’s a lot I can do with the parable of the weeds, because it will allow me to talk about the problem of evil in the world. And that’s a whole lot more interesting than if I, as a non-expert, got up there and started blathering on about, oh, fitness equipment or something.

The problem of evil affects us all. That’s the ticket. Sermon locked in and ready to roll.