That'll preach!

 In our preaching group, we have been discussing Saving Eutychus: https://www.savingeutychus.com/

In Chapter 8, we are walked through a sermon. 

The author comments that there comes a moment when (ideally!) it all seems to come together. That's my experience too. 

As you think about your hearers and the text, you are looking for a big idea (ideally maybe even the main idea of the text, or at least something congruent with the melodic line of the passage). But you also want to begin to see how it will connect with and apply to your congregation. It's then that you begin to think, "yes, aha! This'll preach!". It's at that point that you can write out your theme and aim sentence and headings and introduction and conclusion and work on applications and illustrations to the extent that you believe in such things!