51 But, my brother, if you forbear seeking the empty honour which comes from men, and despise the reproach of fools, who will be ready to say, “Why do you now destroy what you once laboured to build up?” it seems to me to be beyond doubt that you will now pass over to the Church which I perceive that you acknowledge to be the true Church: the proofs of which sentiment on your part I find at hand. For in the beginning of your letter which I am now answering you have these words: “I knew you, my excellent friend, as a man devoted to peace and uprightness, when you were still far removed from the Christian faith, and were in these earlier days occupied with literary pursuits; but since your conversion at a more recent time to the Christian faith, you give your time and labour, as I am informed by the statements of many persons, to theological controversies.” These words are undoubtedly your own, if you were the person who sent me that letter. Seeing, therefore, that you confess that I have been converted to the Christian faith, although I have not been converted to the sect of the Donatists or of the Rogatists, you unquestionably uphold the truth that beyond the pale of Rogatists and Donatists the Christian faith exists. This faith therefore is, as we say, spread abroad throughout all nations, which are according to God's testimony blessed in the seed of Abraham. Why therefore do you still hesitate to adopt what you perceive to be true, unless it be that you are humbled because at some former time you did not perceive what you now see, or maintained some different view, and so, while ashamed to correct an error, are not ashamed (where shame would be much more reasonable) of remaining wilfully in error?
52. Such conduct the Scripture has not passed over in silence; for we read, “There is a shame which brings sin, and there is a shame which is graceful and glorious.” Shame brings sin, when through its influence any one forbears from changing a wicked opinion, lest he be supposed to be fickle, or be held as by his own judgment convicted of having been long in error: such persons descend into the pit alive, that is, conscious of their perdition; whose future doom the death of Dathan and Abiram and Korah, swallowed up by the opening earth, long ago prefigured. But shame is graceful and glorious when one blushes for his own sin, and by repentance is changed to something better, which you are reluctant to do because overpowered by that false and fatal shame, fearing lest by men who know not whereof they affirm, that sentence of the apostle may be quoted against you: “If I build again the things which I destroyed, I make myself a transgressor.” If, however, this sentence admitted of application to those who, after being corrected, preach the truth which in their perversity they opposed, it might have been said at first against Paul himself, in regard to whom the churches of Christ glorified God when they heard that he now “preached the faith which once he destroyed.”
53. Do not, however, imagine that one can pass from error to truth, or from any sin, be it great or small, to the correction of his sin, without giving some proof of his repentance. It is, however, an error of intolerable impertinence for men to blame the Church, which is proved by so many Divine testimonies to be the Church of Christ, for dealing in one way with those who forsake her, receiving them back on condition of correcting this fault by some acknowledgment of their repentance, and in another way with those who never were within her pale, and are receiving welcome to her peace for the first time; her method being to humble the former more fully, and to receive the latter upon easier terms, cherishing affection for both, and ministering with a mother's love to the health of both.
You have here perhaps a longer letter than you desired. It would have been much shorter if in my reply I had been thinking of you alone; but as it is, even though it should be of no use to yourself, I do not think that it can fail to be of use to those who shall take pains to read it in the fear of God, and without respect of persons. Amen.
Source: Letters (New Advent)