How might we keep the Law which we've never kept before? By putting on the Lord Jesus Christ. That is it. It is the only way. It is in being loved, being forgiven, being fed the Holy Supper that not only is sin forgiven but faith is also strengthened. In that - these things that God has given for His Church, for her faith and life - the Holy Spirit takes up residence and works do follow. The only way for sinners like us to keep the Law is to have the Law kept for us.
David H. Petersen, "God With Us," page 22