Why does Paul reject sin under grace and urge justice’s service?

Paul rejects continuing in sin so that grace may abound. Those dead to sin cannot keep living in it. People baptized in Jesus are baptized into his death and buried together through baptism, so that as Christ rose through the Father’s glory they may walk in newness of life. If planted together in the likeness of his death, they shall also share the likeness of his resurrection. The old man is crucified so that the body of sin may be destroyed and sin no longer served. The annotation identifies the old man as the corrupt state derived from Adam, subject to sin and concupiscence, the new man as the state reformed by Christ, and the body of sin as the former ruling vices and sins.

One who is dead is justified from sin. If they died with Christ, they believe they shall also live with him. The risen Christ dies no more and death has no dominion over him: he died once to sin and now lives to God. They should reckon themselves dead to sin and alive to God in Jesus. Sin must not reign in their mortal bodies through obedience to lusts. Their members should not be instruments of iniquity, but offered to God as instruments of justice, with themselves alive from the dead. Sin shall not dominate, because they are under grace rather than law.

Paul again rejects sinning because they are under grace rather than law. Yielding as obedient servants makes them servants of the master obeyed, whether sin unto death or obedience unto justice. He thanks God that former servants of sin now obey from the heart the form of doctrine into which they were delivered. Freed from sin, they became servants of justice. Speaking humanly because of their flesh’s infirmity, he compares their former yielding to uncleanness and iniquity with their present yielding to justice unto sanctification. As sin’s servants they were free men to justice. What fruit came from the things of which they are now ashamed, whose end is death? Now freed from sin and servants of God, they have fruit unto sanctification and the end everlasting life. Sin’s wages are death, while God’s grace is everlasting life in Jesus.