If you’re tying to teach something, launching a surprise shouldn’t be the aim.
In fact, the aim should be predictability.
No matter if it is in the classroom or the pulpit…
Your content should be predictable.
Your delivery should be predictable.
Your links between points should be predictable.
While I don’t want to downplay creativity or innovation, these should be the trimmings affixed to a rather orthodox lesson.
A marker that your lesson has been effective is that your listeners/students can make the connection between the segments of your lesson without significant assistance.
For, they should be able to see how your points hang together.
They should be able to see how one leads to another.
Better yet, they should be able to predict what direction your lesson or sermon is taking while you are still in the middle of delivering it.
A sign of an ineffective teacher or preacher is if they regularly take a twist that no one sees coming.
The reason is simple.
You should, for the vast majority of your teaching, be sticking to the tried and tested points and techniques.
There’s a good reason they exist.
Doing so will result in more effective lessons and, ultimately, far more retention of your content because they aren’t being rocked by a theological, intellectual or pedagogical roller coaster.