Ed Stetzer on Preaching that Sticks:
If you want your sermon to stick, you must pull back the curtain to reveal who God is, who we are and what He really wants. It is too easy for preachers to slip into becoming moral teachers—religious instructors who pass out rules for spiritual living without pulling back the curtain on God and ourselves; pulling back that curtain is what our people need the most!
Your hearers need a clear word about exactly who God is in His character, work and will…
We need to avoid preaching mere ought-to and how-to messages, and instead preach law and Gospel together. This displays God as He is, His law for our lives, our fallen nature and how God offers us grace in Christ. In pulling back the curtain, we then can focus on the need for our hearers to respond to all that God has revealed in His Word.