What shall we say then? Shall we continue in sin, that grace may abound?
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Ambrosiaster
AD 400
The believer who returns to his former way of life rejects the kingdom of God’s grace and returns to sin, i.e., to the pattern of his previous life. For we have received mercy for two reasons: first, that the kingdom of the devil might be removed, and second, that the rule of God might be proclaimed to the ignorant, for it was by this means that we came to desire this dignity. Commentary on Paul’s Epistles.
Shall we continue in sin that grace may abound? He puts and rejects the same objection as before. (Chap. iii. ver. 7.) And having set forth in the last chapter the grace and advantages by Christ's coming, he now exhorts them to avoid sinning, and live in the grace of God. (Witham)
Paul is once more starting to exhort his hearers, but he does so indirectly, as if it arose naturally out of his teaching, so as not to appear to be irksome and vexing.
After showing that it is through Christ’s grace that we are freed from the sin of our first parent and from that which abounded by reason of the Law [n. 406], the Apostle now shows that Christ’s grace gives us the power to resist further sin. In regard to this he does two things: first, he raises a question suggested by the foregoing; secondly, he answers it [v. 2; n. 470]. 469. Above he had said that "where sin increased, grace abounded all the more." This could be misinterpreted by supposing that an increase of sin causes grace to abound all the more. That is why he asks: What shall we say then? Are we to continue in sin that grace may abound? One would have to say, Yes, if increase of sin were the cause and 239 not merely the occasion of grace abounding. Hence he had stated above (3:8): "And why not do evil that good may come? -- as some slanderously charge us with saying." "Why does the way of the wicked prosper? Why do all who are treacherous thrive?" (Jer 12:1). 470. Then (v. 2) ...