An important concept that cannot be ignored in sermon preparation is the fact that the sermon needs to have a purpose–a reason for existing. A meandering monologue that seems to wander to and fro can be muddy, disorganized, frustrating, and unprofitable to the listener.

Each of the biblical writers had a reason for why they wrote their biblical texts, so too the biblical expositor needs to have a purpose as well. He must enter into his sermon preparation with a clear understanding of what he is expecting his hearer to do when he has finished explaining, illustrating, and applying the biblical text.

Whether it is to glorify God, come to repentance, understand a theological concept more clearly, obey a command, or some other purpose, the sermon needs to have a clear purpose.

Can you imagine what it was like for the Israelites to wander in the wilderness for forty years? If you’ve ever sat in a sermon with no point, then you may have felt like an Israelite for 45 minutes, and it probably felt like you were suffering for over an hour!

One way to help yourself not be “that guy” is to think about your sermon as an apologetic argument. You are seeking to prove to your listener your main premise. Not every sermon will benefit from this idea, but there are some sermon texts that will be particularly suited for this concept. I have made a graphic to help explain the idea:

If you think about your sermon like an inverted funnel, with the premise to be proven in your introduction, each successive point will develop and build up to the conclusion. The conclusion should leave your hearer with the strong evidence that your premise is true. You want them to understand that they should either accept your biblical premise or they must deny the clear teaching of Scripture.

A simple example of this type of sermon outline is:

• Premise: Jesus Christ is the Son of God
• Point/Proof 1: His virgin birth prophesied
• Point/Proof 2: His sinless life practiced
• Point/Proof 3: His resurrection proven
• Conclusion: Therefore, you must believe on the Lord Jesus Christ

In this form of sermon organization, the conclusion is what you are seeking as your verdict. You state it, prove it, and then call your hearer to act. And this action may be simply a change of thinking as much as it could be a change of behavior.

This does not mean that your hearer will necessarily respond as you expect–heart change is the work of the Holy Spirit. But by organizing your message in this way you will make your expectations clear and prove your premise. Hopefully your making it irrefutable from Scripture.

The sinful heart may still reject the truth, but you will have accomplished your goal as an expositor to deliver the message faithfully and compellingly.