35 As to the charge that they bring against us, that we covet and plunder their possessions, I would that they would become Catholics, and possess in peace and love with us, not only what they call theirs, but also what confessedly belongs to us. But they are so blinded with the desire of uttering calumnies, that they do not observe how inconsistent their statements are with one another. At any rate, they assert, and seem to make it a subject of most invidious complaint among themselves, that we constrain them to come in to our communion by the violent authority of the laws—which we certainly should not do by any means, if we wished to gain possession of their property. What avaricious man ever wished for another to share his possessions? Who that was inflamed with the desire of empire, or elated by the pride of its possession, ever wished to have a partner? Let them at any rate look on those very men who once belonged to them, but now are our brethren joined to us by the bond of fraternal affection, and see how they hold not only what they used to have, but also what was ours, which they did not have before; which yet, if we are living as poor in fellowship with poor, belongs to us and them alike; while, if we possess of our private means enough for our wants, it is no longer ours, inasmuch as we do not commit so infamous an act of usurpation as to claim for our own the property of the poor, for whom we are in some sense the trustees.
36. Everything, therefore, that was held in the name of the churches of the party of Donatus, was ordered by the Christian emperors, in their pious laws, to pass to the Catholic Church, with the possession of the buildings themselves. Seeing, then, that there are with us poor members of those said churches who used to be maintained by these same paltry possessions, let them rather cease themselves to covet what belongs to others while they remain outside, and so let them enter within the bond of unity, that we may all alike administer, not only the property which they call their own, but also with it what is asserted to be ours. For it is written "All are yours; and you are Christ's; and Christ is God's." Under Him as our Head, let us all be one in His one body; and in all such matters as you speak of, let us follow the example which is recorded in the Acts of the Apostles: "They were of one heart and of one soul: neither said any of them that anything of the things which he possessed was his own; but they had all things common." Let us love what we sing: "Behold, how good and how pleasant it is for brethren to dwell together in unity!" that so they may know, by their own experience, with what perfect truth their mother, the Catholic Church, calls out to them what the blessed apostle writes to the Corinthians: "I seek not yours, but you."
37. But if we consider what is said in the Book of Wisdom, "Therefore the righteous spoiled the ungodly;" and also what is said in the Proverbs, "The wealth of the sinner is laid up for the just;" then we shall see that the question is not, who are in possession of the property of the heretics? But who are in the society of the just? We know, indeed, that the Donatists arrogate to themselves such a store of justice, that they boast not only that they possess it, but that they also bestow it upon other men. For they say that any one whom they have baptized is justified by them, after which there is nothing left for them but to say to the person who is baptized by them that he must needs believe in him who has administered the sacrament; for why should he not do so, when the apostle says, "To him that believes in Him that justifies the ungodly, his faith is counted for righteousness?" Let him believe, therefore, upon the man by whom he is baptized, if it be none else that justifies him, that his faith may be counted for righteousness. But I think that even they themselves would look with horror on themselves, if they ventured for a moment to entertain such thoughts as these. For there is none that is just and able to justify, save God alone. But the same might be said of them that the apostle says of the Jews, that "being ignorant of God's righteousness, and going about to establish their own righteousness, they have not submitted themselves unto the righteousness of God."
38. But far be it from us that any one of our number should call himself in such wise just, that he should either go about to establish his own righteousness, as though it were conferred upon him by himself, whereas it is said to him, "For what have you that you did not receive?" or venture to boast himself as being without sin in this world, as the Donatists themselves declared in our conference that they were members of a Church which has already neither spot nor wrinkle, nor any such thing, — not knowing that this is only fulfilled in those individuals who depart out of this body immediately after baptism, or after the forgiveness of sins, for which we make petition in our prayers; but that for the Church, as a whole, the time will not come when it shall be altogether without spot or wrinkle, or any such thing, till the day when we shall hear the words, "O death, where is your sting? O grave, where is your victory? The sting of death is sin."
39. But in this life, when the corruptible body presses down the soul, if their Church is already of such a character as they maintain, they would not utter unto God the prayer which our Lord has taught us to employ: "Forgive us our debts." For since all sins have been remitted in baptism, why does the Church make this petition, if already, even in this life, it has neither spot nor wrinkle, nor any such thing? They would also have a fight to despise the warning of the Apostle John, when he cries out in his epistle, "If we say that we have no sin, we deceive ourselves, and the truth is not in us. But if we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness." On account of this hope, the universal Church utters the petition, "Forgive us our debts," that when He sees that we are not vainglorious, but ready to confess our sins, He may cleanse us from all unrighteousness, and that so the Lord Jesus Christ may show to Himself in that day a glorious Church, not having spot or wrinkle, or any such thing, which now He cleanses with the washing of water in the word: because, on the one hand, there is nothing that remains behind in baptism to hinder the forgiveness of every bygone sin (so long, that is, as baptism is not received to no effect without the Church, but is either administered within the Church, or, at least, if it has been already administered without, the recipient does not remain outside with it); and, on the other hand, whatever pollution of sin, of whatsoever kind, is contracted through the weakness of human nature by those who live here after baptism, is cleansed away in virtue of the same laver's efficacy. For neither is it of any avail for one who has not been baptized to say, "Forgive us our debts."
Source: Letters (New Advent)