Why did God give His Law? According to Romans 5:20, one of the purposes of the Law is so that sin increases. Knowledge of the Law actually causes more sin. But the good news is that where sin increased, God’s grace abounded all the more. Donald Grey Barnhouse put it this way, “Where sin reached a high-water mark, grace completely flooded the world.” The abundant and sufficient grace of God is the answer to the evil in the world and the sin of our own lives.