Letter 1
6 For such is the loving-kindness of God; He never turns his face away from a sincere repentance, but if any one has pushed on to the very extremity of wickedness, and chooses to return thence towards the path of virtue, God accepts and welcomes, and does everything so as to restore him to his former position. And He does what is yet more merciful; for even should any one not manifest complete repentance, he does not pass by one which is small and insignificant, but assigns a great reward even to this; which is evident from what Esaias the prophet says concerning the people of the Jews, speaking on this wise: “On account of his sin I put him to pain for a little while, and smote him, and turned my face away from him, and he was pained, and walked sorrowfully, and then I healed him, and comforted him.” And we might cite as another witness that most ungodly king, who was given over to sin by the influence of his wife: yet when he only sorrowed, and put on sackcloth, and condemned his offenses, he so won for himself the mercy of God, as to be released from all the evils which were impending over him. For God said to Elias “Do you see how Ahab is pricked in the heart before my face? I will not bring the evil upon him in his own days, because he has wept before me.” And after this again, Manasses, having exceeded all in fury and tyranny, and having subverted the legal form of worship, and shut up the temple, and caused the deceit of idolatry to flourish, and having become more ungodly than all who were before him, when he afterwards repented, was ranked among the friends of God. Now if, looking to the magnitude of his own iniquities, he had despaired of restoration and repentance, he would have missed all which he afterwards obtained: but as it was, looking to the boundlessness of God's tender mercy instead of the enormity of his transgressions, and having broken in sunder the bonds of the devil, he rose up and contended with him, and finished the good course. And not only by what was done to these men, but also by the words of the prophet does God destroy the counsels of despair, speaking on this wise: “Today, if you will hear His voice, harden not your hearts, as in the provocation.” Now that expression “today,” may be uttered at every time of life, even on the verge of old age, if you desire it: for repentance is judged not by quantity of time, but by disposition of the soul. For the Ninevites did not need many days to blot out their sin, but the short space of one day availed to efface all their iniquity: and the robber also did not take a long time to effect his entrance into Paradise, but in such a brief moment as one might occupy in uttering a single word, did he wash off all the sins which he had committed in his whole life, and received the prize bestowed by the divine approval even before the Apostles. And we also see the martyrs obtain glorious crowns for themselves in the course, not of many years, but of a few days, and often in a single day only.
7. Wherefore we have need of zeal in every direction, and much preparation of mind: and if we so order our conscience as to hate our former wickedness, and choose the contrary path with as much energy as God desires and commands, we shall not have anything less on account of the short space of time: many at least who were last have far outstripped those who were first. For to have fallen is not a grievous thing, but to remain prostrate after falling, and not to get up again; and, playing the coward and the sluggard, to conceal feebleness of moral purpose under the reasoning of despair. To whom also the prophet spoke in perplexity saying “Does he who falls not rise up, or he who turns away not turn back?” But if you inquire of me for instances of persons who have fallen away after having believed, all these things have been said with reference to such persons, for he who has fallen belonged formerly to those who were standing, not to those who were prostrate; for how should one in that condition fall? But other things also shall be said, partly by means of parables, partly by plainer deeds and words. Now that sheep which had got separated from the ninety and nine, and then was brought back again, represents to us nothing else than the fall and return of the faithful; for it was a sheep not of some alien flock, but belonging to the same number as the rest, and was formerly pastured by the same shepherd, and it strayed on no common straying, but wandered away to the mountains and in valleys, that is to say some long journey, far distant from the right path. Did he then suffer it to stray? By no means, but brought it back neither driving it, nor beating it, but taking it upon his shoulders. For as the best physicians bring back those who are far gone in sickness with careful treatment to a state of health, not only treating them according to the laws of the medical art, but sometimes also giving them gratification: even so God conducts to virtue those who are much depraved, not with great severity, but gently and gradually, and supporting them on every side, so that the separation may not become greater, nor the error more prolonged. And the same truth is implied in the parable of the prodigal son as well as in this. For he also was no stranger, but a son, and a brother of the child who had been well pleasing to the father, and he plunged into no ordinary vice, but went to the very extremity, so to say, of evil, he the rich and free and well-bred son being reduced to a more miserable condition than that of household slaves, strangers, and hirelings. Nevertheless he returned again to his original condition, and had his former honour restored to him. But if he had despaired of his life, and, dejected by what had befallen him, had remained in the foreign land, he would not have obtained what he did obtain, but would have been consumed with hunger, and so have undergone the most pitiable death: but since he repented, and did not despair, he was restored, even after such great corruption, to the same splendour as before, and was arrayed in the most beautiful robe, and enjoyed greater honours than his brother who had not fallen. For “these many years,” says he “do I serve you, neither transgressed I your commandment at any time, and yet thou never gavest me a kid, that I might make merry with my friends; but when this your son has come who has devoured your living with harlots, you have killed for him the fatted calf.” So great is the power of repentance.
8. Having then such great examples, let us not continue in evil, nor despair of reconciliation, but let us say also ourselves “I will go to my Father,” and let us draw near to God. For He Himself never turns away from us, but it is we who put ourselves far off: for “I am a God” we read “at hand and not a God afar off.” And again, when He was rebuking them by the mouth of this prophet He said “Do not your sins separate between you and me?” Inasmuch then as this is the cause which puts us far from God, let us remove this obnoxious barrier, which prevents any near approach being made.
Source: Two Letters to Theodore After His Fall (New Advent)