Duane Sheriff teaches that God gave us the law out of love. The law reveals our sins so that we may be saved. It acts as a mirror, showing our need for salvation and leading us towards faith in Christ. By highlighting our inability to attain righteousness on our own, the law emphasizes the significance of Jesus' fulfillment of the law on our behalf. This revelation of sin through the law is a necessary step towards embracing God's grace, ultimately leading us to a life of freedom and grace.