The choir has spiritual needs and oftens spiritual commitments. That is why they show up every week.
They need a sermon. They need to keep learning and growing.
Preaching isn’t just about telling people to care. It’s also about telling them how. And reminding people who already care that their efforts matter and are appreciated, and that they still have room to grow.
No group can be outreach-oriented all the time. Not religious groups, not activist groups, not social groups - everything has to, at times, focus on the needs of committed members.
Preaching to the choir isn’t enough. But it’s not something you should neglect, either.