12. Et erit cum impleti fuerint septuaginta anni, visitabo super regem Babylonis et super populum ejus, dicit Jehova, iniquitatem ipsorum, et super terram Chaldaorum, et ponam eam in desolationes saeculi (id est, perpetuas.)
The Prophet now, as I have said, shews more clearly why the time of the captivity and exile had been defined, even that the faithful might know that God would not forget his covenant, though he deprived the people of the inheritance of the land. These words were not addressed indiscriminately to the whole body of the people, as we have observed before in other places; but the Prophet intended to consult the benefit of God's elect, who always retained a concern for true religion; for they must have a hundred times despaired had not this promise been added. This, then, was a special doctrine intended as food for God's children; for he addressed, as it was apart, the elect and faithful only.
God says also, that at the end of seventy years he would visit the iniquity of the king of Babylon, and of his whole people. We hence learn that Nebuchadnezzar was not called God's servant because he deserved anything for his service, but because God led him while he was himself unconscious, or not thinking of any such thing, to do a service which neither he nor his subjects understood to be for God. Though, then, the Lord employs the ungodly in executing his judgments, yet their guilt is not on this account lessened; they are still exposed to God's judgment. And these two things well agree together, -- that the devil and all the ungodly serve God, though not of their own accord, but whenever he draws them by his hidden power, and that they are still justly punished, even when they have served God; for though they perform his work, yet not because they are commanded to do so. They are therefore justly liable to punishment, according to what the Prophet teaches us here.