1Th 4:1-2(1) Finally, then, brothers, we ask and urge you in the Lord Jesus, that as you received from us how you ought to live and to please God, just as you are doing, that you do so more and more.(2) For you know what instructions we gave you through the Lord Jesus.
Lauterbach: “Was this church some paragon of godliness? Well, there was clearly a work of grace in their midst, a powerful one at that. But the fact that Paul has to instruct them on the sinfulness of sexual immorality, and the urgency of work shows they had sin present among them. There may have been division too as he has to speak to them of love. And their eschatology was confused. The latter problem and the issue of laziness will become so pronounced that he will have to write the second letter to help them more. No, they are no super-saints.
How then are they pleasing God?
It is because of the work of Christ. They are in Christ.”