But if our unrighteousness commends the righteousness of God, what shall we say? Is God unrighteous who takes vengeance? (I speak as a man)
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Ambrosiaster
AD 400
David had sinned in the case of Uriah the Hittite. Because he knew that the promise would not be given to sinners, he pleaded that the righteousness of the words of God might overrule the judgment which said that the promise should not be given to sinners and that it might sanctify the penitent in order to give him what God had promised he would give to the righteous. To this Paul adds that … if God is justified because we are sinners, it would be wrong of him to pardon us on that account. If it can really be said that our wickedness is of some advantage to God, then there is some measure of truth in this reasoning. But it is dangerous to speak like that. God is not unjust if he judges, because our unrighteousness is of no benefit to him. It is not as if he would somehow be justified by our sins or as if he would somehow rejoice at our sins, by which he alone would then appear to be righteous. This way of thinking suits men but not God, because it does not happen that God should ever be unjust, only man. Nor does our unrighteousness make God righteous if he gives to us sinners what he promised to the saints, for although we are sinners, we are reformed by repentance so that it is not as sinners but as those who have been cleansed that we are readied to receive the promise. Commentary on Paul’s Epistles.