6 We rely, however, not so much on these documents as on the Holy Scriptures, wherein a dominion extending to the ends of the earth among all nations is promised as the heritage of Christ, separated from which by their sinful schism they reproach us with the crimes which belong to the chaff in the Lord's threshing-floor, which must be permitted to remain mixed with the good grain until the end come, until the whole be winnowed in the final judgment. From which it is manifest that, whether these charges be true or false, they do not belong to the Lord's wheat, which must grow until the end of the world throughout the whole field, i.e. the whole earth; as we know, not by the testimony of a false angel such as confirmed your correspondent in his error, but from the words of the Lord in the Gospel. And because these unhappy Donatists have brought the reproach of many false and empty accusations against Christians who were blameless, but who are throughout the world mingled with the chaff or tares, i.e. with Christians unworthy of the name, therefore God has, in righteous retribution, appointed that they should, by their universal Council, condemn as schismatics the Maximianists, because they had condemned Primianus, and baptized while not in communion with Primianus, and rebaptized those whom he had baptized, and then after a short interval should, under the coercion of Optatus the minion of Gildo, reinstate in the honours of their office two of these, the bishops Felicianus of Musti and Prætextatus of Assuri, and acknowledge the baptism of all whom they, while under sentence and excommunicated, had baptized. If, therefore, they are not defiled by communion with the men thus restored again to their office—men whom with their own mouth they had condemned as wicked and impious, and whom they compared to those first heretics whom the earth swallowed up alive, — let them at last awake and consider how great is their blindness and folly in pronouncing the whole world defiled by unknown crimes of Africans, and the heritage of Christ (which according to the promise has been shown unto all nations) destroyed through the sins of these Africans by the maintenance of communion with them; while they refuse to acknowledge themselves to be destroyed and defiled by communicating with men whose crimes they had both known and condemned.
7. Wherefore, since the Apostle Paul says in another place, that even Satan transforms himself into an angel of light, and that therefore it is not strange that his servants should assume the guise of ministers of righteousness: if your correspondent did indeed see an angel teaching him error, and desiring to separate Christians from the Catholic unity, he has met with an angel of Satan transforming himself into an angel of light. If, however, he has lied to you, and has seen no such vision, he is himself a servant of Satan, assuming the guise of a minister of righteousness. And yet, if he be not incorrigibly obstinate and perverse, he may, by considering all the things now stated, be delivered both from misleading others, and from being himself misled. For, embracing the opportunity which you have given, we have met him without any rancour, remembering in regard to him the words of the apostle: “The servant of the Lord must not strive; but be gentle unto all men, apt to teach, patient; in meekness instructing those that oppose themselves; if God perhaps will give them repentance to the acknowledging of the truth; and that they may recover themselves out of the snare of the devil, who are taken captive by him at his will.” If, therefore, we have said anything severe, let him know that it arises not from the bitterness of controversy, but from love vehemently desiring his return to the right path. May you live safe in Christ, most beloved and honourable brother!
Source: Letters (New Advent)