If you try to write an effective sermon in as little time as possible, you’ll end up with an ineffective sermon.
Darryl Dash has an article on “Six Keys to Poor Preaching.” Each key is a shortcut. You can’t write an effective sermon if you’re going for a personal best time. But here are six ways we try:
1. Skip on exegesis
2. Forget the big idea
3. Come up with your own purpose for the sermon
4. Prepare at the last minute
5. Preach moralism
6. Preach to everyone in general
I encourage you to read the whole thing.
And, by the way, Dash follows up this article with one on “The Fundamentals of Good Preaching” that will be worth your time, too.