Tertullian

With what God? Him whose enemies we have never, in any dispensation, been? Or Him against whom we have rebelled, both in relation to His written law and His law of nature? Now, as peace is only possible towards Him with whom there once was war, we shall be both justified by Him, and to Him also will belong the Christ, in whom we are justified by faith, and through whom alone God's enemies can ever be reduced to peace. "Moreover," says he, "the law entered, that the offence might abound." And wherefore this? "In order," he says, "that (where sin abounded), grace might much more abound.

And wherefore this? "In order," he says, "that (where sin abounded), grace might much more abound." Whose grace, if not of that God from whom also came the law? Unless it be, forsooth, that the Creator intercalated His law for the mere purpose of producing some employment for the grace of a rival god, an enemy to Himself (I had almost said, a god unknown to Him), "that as sin had" in His own dispensation "reigned unto death, even so might grace reign through righteousness unto (eternal) life by Jesus Christ," His own antagonist! For this (I suppose it was, that) the law of the Creator had "concluded all under sin," and had brought in "all the world as guilty (before God)," and had "stopped every mouth," so that none could glory through it, in order that grace might be maintained to the glory of the Christ, not of the Creator, but of Marcion! I may here anticipate a remark about the substance of Christ, in the prospect of a question which will now turn up.