Lucius Caecilius Firmianus Lactantius

When the Jews often resisted wholesome precepts, and departed from the divine law, going astray to the impious worship of false gods, then God filled just and chosen men with the Holy Spirit, appointing them as prophets in the midst of the people, by whom He might rebuke with threatening words the sins of the ungrateful people, and nevertheless exhort them to repent of their wickedness; for unless they did this, and, laying aside their vanities, return to their God, it would come to pass that He would change His covenant, that is, bestow the inheritance of eternal life upon foreign nations, and collect to Himself a more faithful people out of those who were aliens by birth. But they, when rebuked by the prophets, not only rejected their words; but being offended because they were upbraided for their sins, they slew the prophets themselves with studied tortures.

But because I had said that the anger of God is not for a time only, as is the case with man, who becomes inflamed with an immediate excitement, and on account of his frailty is unable easily to govern himself, we ought to understand that because God is eternal, His anger also remains to eternity; but, on the other hand, that because He is endued with the greatest excellence, He controls His anger, and is not ruled by it, but that He regulates it according to His will. And it is plain that this is not opposed to that which has just been said. For if His anger had been altogether immortal, there would be no place after a fault for satisfaction or kind feeling, though He Himself commands men to be reconciled before the setting of the sun. But the divine anger remains for ever against those who ever sin. Therefore God is appeased not by incense or a victim, not by costly offerings, which things are all corruptible, but by a reformation of the morals: and he who ceases to sin renders the anger of God mortal.