When I came to you, brothers and sisters, I did not come proclaiming the mystery of God to you in lofty words or wisdom. For I decided to know nothing among you except Jesus Christ, and him crucified. And I came to you in weakness and in fear and in much trembling. My speech and my proclamation were not with plausible words of wisdom, but with a demonstration of the Spirit and of power, so that your faith might rest not on human wisdom but on the power of God.
—1 Corinthians 2.1-5
This encourages me so much in preaching. No matter the exegesis, eloquence, or whatever, we preach Christ and him crucified, and that makes a good sermon. We also live a life in accordance with that outside of the sermon and it supports our preaching as well. Just as in the nature of God Himself, our words and our deeds cannot be separated from one another.