Here is a comment from a church member that I thought was well put and edifying so I share it with you:
I just wanted to let you know that the Lord has spoken to me through your messages on Galatians. I know you feel like you are saying the same things over and over, but you also rightly recognize that we can never really mature beyond justification by faith.
If I could express something of the impact that your messages have had on me, I would say that the sting of my sin has been blunted. This is true not only in the sense that guilt and creeping despair have lost power over me because of the gospel, but also in the sense that sin seems less alluring because of the doctrine of justification by faith. I recognize much more readily now how easily I slip into tying my subjective sense of standing with God to my performance. Thank you for exposing that to me and killing it through your faithful proclamation of the Word of God. Christ is addressing his people through you week by week.
Don't let the pressure toward novelty cause you to lose sleep during sermon preparation. We don't need something new. We need the old truths that have been proclaimed for centuries….
Let us be faithful to keep preaching the old truths.