Does salvation give a Christian a license to sin? If God's grace abounds when we sin, then why should we not continue to sin so His grace can continue to abound. The repetition of the word "know" (vs. 3,6,11) indicates Paul wanted Christians to understand that doctrine and duty go hand in hand. A child of God is to act like a child of God. In Romans 5:12, Paul made a transition from "sins" as action to "sin" as a principle. Sin, in all its forms, should not reign over a child of God.