was “restoration” or “improvement.” It was what you might do to a city or a building that had fallen into ruin. From that meaning, though, arose the idea of “restoring” or “improving” one’s ethical character and behavior. That is apparently the meaning Paul uses here. Scripture is useful for restoring a Christian’s ethical character that has fallen into disrepair. If “reproof” has to do with confronting and refuting doctrinal error, “correction” has to do with confronting and refuting ethical error.