What then? shall we sin, because we are not under the law, but under grace? God forbid.
Read Chapter 6
Ambrosiaster
AD 400
Although it was right for the law to be given—for it was given in order to show that those who sinned against it were guilty before God and in order to dissuade people from continuing to sin—yet because of the weakness of its infirmity the human race was unable to restrain itself from sin and had become subject to the death of hell. God was moved by the righteousness of his mercy, by which he always comes to the aid of the human race, and through Christ he provided a way by which he could reward those who were without hope. By forgiving their sins he released them from the law which had held them subject. Restored and made whole again by the help of God, they could reject the sins by which they had previously been held down. Therefore we did not sin in rejecting the law but rather we followed the providence of God himself through Christ. Commentary on Paul’s Epistles.
Ipse enim egregius Apostolus in verbis, quae praedictae dictioni subjungit, intentati criminis afferet solutionem: "Quid ergo? peccabimus, quia non sumus sub lege, sed sub gratia? Abs it."