 Paul tells them, listen, it's right for God to repay, to recompense those who have persecuted you. And not just those, as we see what he's driving at here, because he's going to take this all the way to future judgment when the Lord Jesus Christ returns. There is no getting away with it. There are times that we see it in Scripture that God does repay quickly. That's in his sovereignty. There are times he does that, but it's not in the majority of times in the Bible. But there is a day coming where he has set aside for that.