As @mhm-philippines said, while we are no longer under the (Mosaic) law, I believe that the preaching of the law is important to show sinners just how sinful they are. A person can't be saved from their sins, until they recognize that they are sinful. That is the purpose of the law. Once they recognize it, then the gospel of grace can be preached to a hungry and thirsting person.
I'm enjoying these studies. Please continue.
RE: BIBLE DOCTRINE SURVEY - GOD - THE WORKS OF GOD - nr 4