What are you forgetting?

A recent post by Tullian Tchividjian entitled Reminders Are More Effective Than Rebukes reminded me a bit of a quote that I came across a while back from Mike Horton (Christless Christianity, p. 116):

It is interesting that when the apostle Paul had to write a disciplinary letter to the Corinthian church for its sexual immorality, hypocrisy, strife, and pride, he began by telling them the gospel all over again. He never assumed it. In fact, he assumed that if the church is in a particular mess ethically, it probably did not really get the message yet. Only after once again preaching Christ and him crucified would Paul turn to the practical exhortation to live in the light of their high calling in Christ.