21 And to this day they administer baptism outside of the communion of the Church, and, if they can, they rebaptize the members of the Church: they offer sacrifice in discord and schism, and salute in the name of peace communities which they pronounce beyond the bounds of the peace of salvation. The unity of Christ is rent asunder, the heritage of Christ is reproached, the baptism of Christ is treated with contempt; and they refuse to have these errors corrected by constituted human authorities, applying penalties of a temporal kind in order to prevent them from being doomed to eternal punishment for such sacrilege. We blame them for the rage which has driven them to schism, the madness which makes them rebaptize, and for the sin of separation from the heritage of Christ, which has been spread abroad through all lands. In using manuscripts which are in their hands as well as in ours, we mention churches, the names of which are now read by them also, but with which they have now no communion; and when these are pronounced in their conventicles, they say to the reader, “Peace be with you;” and yet they have no peace with those to whom these letters were written. They, on the other hand, blame us for crimes of men now dead, making charges which either are false, or, if true, do not concern us; not perceiving that in the things which we lay to their charge they are all involved, but in the things which they lay to our charge the blame is due to the chaff or the tares in the Lord's harvest, and the crime does not belong to the good grain; not considering, moreover, that within our unity those only have fellowship with the wicked who take pleasure in their being such, whereas those who are displeased with their wickedness yet cannot correct them—as they do not presume to root out the tares before the harvest, lest they root out the wheat also, — have fellowship with them, not in their deeds, but in the altar of Christ; so that not only do they avoid being defiled by them, but they deserve commendation and praise according to the word of God, because, in order to prevent the name of Christ from being reproached by odious schisms, they tolerate in the interest of unity that which in the interest of righteousness they hate.
22. If they have ears, let them hear what the Spirit says to the churches. For in the Apocalypse of John we read: “Unto the angel of the Church of Ephesus write: These things says He that holds the seven stars in His right hand, who walks in the midst of the seven golden candlesticks; I know your works, and your labour, and your patience, and how you can not bear them which are evil: and you have tried them which say they are apostles, and are not, and hast found them liars: and hast borne, and hast patience, and for My name's sake hast tolerated them, and hast not fainted.” Now, if He wished this to be understood as addressed to a celestial angel, and not to those invested with authority in the Church, He would not go on to say: “Nevertheless I have somewhat against you, because you have left your first love. Remember therefore from whence you are fallen, and repent, and do the first works; or else I will come unto you quickly, and will remove your candlestick out of his place, unless you repent.” This could not be said to the heavenly angels, who retain their love unchanged, as the only beings of their order that have departed and fallen from their love are the devil and his angels. The first love here alluded to is that which was proved in their tolerating for Christ's name's sake the false apostles. To this He commands them to return, and to do “their first works.” Now we are reproached with the crimes of bad men, not done by us, but by others; and some of them, moreover, not known to us. Nevertheless, even if they were actually committed, and that under our own eyes, and we bore with them for the sake of unity, letting the tares alone on account of the wheat, whosoever with open heart receives the Holy Scriptures would pronounce us not only free from blame, but worthy of no small praise.
23. Aaron bears with the multitude demanding, fashioning, and worshipping an idol. Moses bears with thousands murmuring against God, and so often offending His holy name. David bears with Saul his persecutor, even when forsaking the things that are above by his wicked life, and following after the things that are beneath by magical arts, avenges his death, and calls him the Lord's anointed, because of the venerable right by which he had been consecrated. Samuel bears with the reprobate sons of Eli, and his own perverse sons, whom the people refused to tolerate, and were therefore rebuked by the warning and punished by the severity of God. Lastly, he bears with the nation itself, though proud and despising God. Isaiah bears with those against whom he hurls so many merited denunciations. Jeremiah bears with those at whose hands he suffers so many things. Zechariah bears with the scribes and Pharisees, as to whose character in those days Scripture informs us. I know that I have omitted many examples: let those who are willing and able read the divine records for themselves: they will find that all the holy servants and friends of God have always had to bear with some among their own people, with whom, nevertheless, they partook in the sacraments of that dispensation, and in so doing not only were not defiled by them, but were to be commended for their tolerant spirit, “endeavouring to keep,” as the apostle says, “the unity of the Spirit in the bond of peace.” Let them also observe what has occurred since the Lord's coming, in which time we would find many more examples of this toleration in all parts of the world, if they could all be written down and authenticated: but attend to those which are on record. The Lord Himself bears with Judas, a devil, a thief, His own betrayer; He permits him, along with the innocent disciples, to receive that which believers know as our ransom. The apostles bear with false apostles; and in the midst of men who sought their own things, and not the things of Jesus Christ, Paul, not seeking his own, but the things of Christ, lives in the practice of a most noble toleration. In fine, as I mentioned a little while ago, the person presiding under the title of Angel over a Church, is commended, because, though he hated those that were evil, he yet bore with them for the Lord's name's sake, even when they were tried and discovered.
24. In conclusion, let them ask themselves: Do they not bear with the murders and devastations by fire which are perpetrated by the Circumcelliones, who treat with honour the dead bodies of those who cast themselves down from dangerous heights? Do they not bear with the misery which has made all Africa groan for years beneath the incredible outrages of one man, Optatus [bishop of Thamugada]? I forbear from specifying the tyrannical acts of violence and public depredations in districts, towns, and properties throughout Africa; for it is better to leave you to speak of these to each other, whether in whispers or openly, as you please. For wherever you turn your eyes, you will find the things of which I speak, or, more correctly, refrain from speaking. Nor do we on this ground accuse those whom, when they do such things, you love. What we dislike in that party is not their bearing with those who are wicked, but their intolerable wickedness in the matter of schism, of raising altar against altar, and of separation from the heritage of Christ now spread, as was so long ago promised, throughout the world. We behold with grief and lamentation peace broken, unity rent asunder, baptism administered a second time, and contempt poured on the sacraments, which are holy even when ministered and received by the wicked. If they regard these things as trifles, let them observe those examples by which it has been proved how they are esteemed by God. The men who made an idol perished by a common death, being slain with the sword: but when the men endeavoured to make a schism in Israel, the leaders were swallowed up by the opening earth, and the crowd of their accomplices was consumed by fire. In the difference between the punishments, the different degrees of demerit may be discerned.
Source: Letters (New Advent)