John Chrysostom
Having suggested to us such great things, and having reminded us of weapons, battle, and warfare, the Apostle again encourages the soldier and awakens readiness in him, saying: "Sin shall not have dominion over you, for you are not under law but under grace."
But if sin no longer has dominion over us, why did the Apostle earlier exhort us, "Let not sin reign in your mortal body," and, "Do not present your members to sin as instruments of unrighteousness"?
What does this saying mean? Here the Apostle briefly expresses a thought that he later must unfold and treat with full skill. What is this thought?
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Before the coming of Christ, our body was easily accessible to sin. After death, a great multitude of passions entered it, and therefore it became exceedingly incapable of walking the path of virtue.
There was not yet the helping Spirit, nor baptism able to mortify. Like an unbridled horse, the body ran and often sinned, because the law prescribed what must be done and what must not be done, but gave the combatants nothing beyond verbal exhortation.
When Christ appeared, the struggle became easier. Therefore, since we have received a share in greater help, more difficult contests have also been appointed for us.
For this reason Christ said: "Unless your righteousness exceeds that of the scribes and Pharisees, you will not enter the Kingdom of Heaven" (Mt 5:20).
The Apostle speaks of this more clearly later, but here he briefly hints at it. He shows that if we do not submit too much to sin, it will not overcome us.
For not only the law commands, but also grace. Grace has forgiven what came before and strengthens for what is to come. The law promised crowns after labors. Grace first crowned us, and then called us to contests.
In my opinion, however, he does not mean here the whole life of the believer. Rather, he makes a comparison between baptism and the law, about which he says elsewhere that "the letter kills, but the Spirit gives life" (2 Cor 3:6).
The law exposes transgression, but grace frees us from it. As the law, by exposing, reveals sin, so grace, by forgiving, does not allow one to remain under sin.
Thus you are freed from the authority of sin in two respects. First, you are not under law. Second, you make use of grace.