Main Point. The Church’s charge is to guard sound doctrine by faith, promote Christlike love, and use God’s law to reveal sin and lead us to the gospel. Driving Question. Why is it essential that we guard the sound doctrine?1. Because sound doctrine protects the church from false teachers (3–7)1 Cor 2 Peter 1 Cor 1 John 2 Corinthians 2 Corinthians 2. Because sound doctrine promotes the true purpose of the law and the gospel (8–11)How does one use the law lawfully?By recognizing the intended function of the law is to point out our sin. Takeaways.We need the law everyday to show us our sin. We need the gospel everyday to remind us that Christ’s righteousness fulfilled the law for us, and the reminder that he paid the penalty of the law for us because of our unrighteousness. We need the gospel every day in order to love God and love people (which fulfills the law). We need to realize that the gospel (and the law) lead us to live a life aimed at the glory of the blessed God.