Romanos 3:5

But if our unrighteousness. — A new and profound question suggests itself to the mind of the Apostle, and his keen intellect will not let it go: “If the sin (here the unbelief) of man only tends to vindicate (commends or establishes) the righteousness of God, why should that sin be punished?” The mere raising of such a question requires an apology; it is only as a man might speak about man that he dares to utter such a thought. That, too, is an impossible objection, for if it held good there could not be any judgment. No sin would be punishable, for all sin would serve to emphasise the strict veracity of God in His denunciations of it, and therefore would ultimately conduce to His glory. It would thus cease to be sinful, and there would be nothing to hinder us from adopting the principle that is so calumniously attributed to us — that it is lawful to do evil that good may come. A calumny it is, and any such principle with all that appertains to it — i.e., with the whole of the preceding argument, — is justly condemned.