Romans 8:4

So that the righteous demands of the Law. Paul said the Law was spiritual (Romans 7:12; Romans 7:14). It offered life to all who kept it PERFECTLY, but crushed all who violated its righteous demands. Christ fulfilled the Law (gave it real meaning) in the fact that he perfectly kept all of its righteous demands! When Christ, as the Proxy of all mankind, fulfilled the Law, it was just as if every man had fulfilled the Law. When Christ died to pay the Law's penalty for sin, it was just as if every sinner had died and paid for his sins. Paul reminds us of this in 2 Corinthians 5:14; 2 Corinthians 5:21. Who live according to the Spirit. Beza pictures the believer as absolutely passive in satisfying the righteous demands of the Law in Christ. It is true that our salvation is ENTIRELY due to God's act in Christ, yet we have been set free from the power of sin and the curse of death IN ORDER THAT we may live according to the Spirit. Luther's comment helps us put it in the right perspective: "This Spirit makes us spiritual, subdues the flesh [human nature], and assures us that as long as we follow the Spirit, resist sin, and endeavor to slay it, we are, nevertheless, the children of God, no matter how violently sin rages in us." See James 2:22-23.