To Sabinianus
1. Of old, when it had repented the Lord that he had anointed Saul to be king over Israel, we are told that Samuel mourned for him; and again, when Paul heard that there was fornication among the Corinthians and such fornication as was not so much as named among the gentiles, he besought them to repent with these tearful words: “lest, when I come again, my God will humble me among you and that I shall bewail many which have sinned already and have not repented of the uncleanness and fornication and lasciviousness which they have committed.” If an apostle or a prophet, themselves immaculate, could speak thus with a clemency embracing all, how much more earnestly should a sinner like me plead with a sinner like you. You have fallen and refuse to rise; you do not so much as lift your eyes to heaven; having wasted your father's substance you take pleasure in the husks that the swine eat; and climbing the precipice of pride you fall headlong into the deep. You make your belly your God instead of Christ; you are a slave to lust; your glory is in your shame; you fatten yourself like a victim for the slaughter, and imitate the lives of the wicked, careless of their doom. “You know not that the goodness of God leads you to repentance. But after your hardness and impenitent heart you store up unto yourself wrath against the day of wrath.” Or is it that your heart is hardened, as Pharaoh's was, because your punishment is deferred and you are not smitten at the moment? The ten plagues were sent upon Pharaoh not as by an angry God but as by a warning father, and his day of grace was prolonged until he repented of his repentance. Yet doom overtook him when he pursued through the wilderness the people whom he had previously let go and presumed to enter the very sea in the eagerness of his pursuit. For only in this one way could he learn the lesson that He is to be dreaded whom even the elements obey. He had said: “I know not the Lord, neither will I let Israel go;” and you imitate him when you say: “The vision that he sees is for many days to come, and he prophesies of the times that are far off.” Yet the same prophet confutes you with these words: “Thus says the Lord God, There shall none of my words be prolonged any more, but the word which I have spoken shall be done.” David too says of the godless (and of godlessness you have proved yourself not a slight but an eminent example), that in this world they rejoice in good fortune and say: “How does God know? And is there knowledge in the Most High? Behold these are the ungodly who prosper in the world; they increase in riches.” Then almost losing his footing and staggering where he stands he complains, saying “Verily I have cleansed my heart in vain, and washed my hands in innocency.” For he had previously said: “I was envious at the foolish, when I saw the prosperity of the wicked. For they have no regard for death, but their strength is firm. They are not in trouble as other men are; neither are they plagued like other men. Therefore pride compasses them about as a chain; violence covers them as a garment. Their eyes stand out with fatness: they have more than heart could wish. They are corrupt, and speak wickedly concerning oppression: they speak loftily. They set their mouth against the heavens, and their tongue walks through the earth.”
Source: Letters (New Advent)