14 If, in the interests of the unity of the party of Donatus, no one rebaptizes those who were baptized in a wicked schism, and men, who are guilty of a crime of such enormity as to be compared by them in their Council to those ancient authors of schism whom the earth swallowed up alive, are either unpunished after separation, or restored again to their position after condemnation; why is it that, in defence of the unity of Christ, which is spread throughout the whole inhabited world, of which it has been predicted that it shall have dominion from sea to sea, and from the river unto the ends of the earth, — a prediction which seems from actual proof to be in process of fulfillment; why is it that, in defence of this unity, they do not acknowledge the true and universal law of that inheritance which rings forth from the books that are common to us all: "I shall give You the heathen for Your inheritance, and the uttermost parts of the earth for Your possession?" In behalf of the unity of Donatus, they are not compelled to call together again what they have scattered abroad, but are warned to hear the cry of the Scriptures: why will they not understand that they meet with such treatment through the mercy of God, that since they brought false charges against the Catholic Church, by contact as it were with which they were unwilling to defile their own excessive sanctity, they should be compelled by the sovereign authority of Optatus Gildonianus to receive again and associate with themselves true offenses of the greatest enormity, condemned by the true voice, as they say, of their own plenary Council? Let them at length perceive how they are filled with the true crimes of their own party, after inventing fictitious crimes wherewith to charge their brethren, when, even if the charges had been true, they ought at length to feel how much should be endured in the cause of peace, and in behalf of Christ's peace to return to a Church which did not condemn crimes undiscovered, if on behalf of the peace of Donatus they were ready to pardon such as were condemned.
Source: Answer to Letters of Petilian, Bishop of Cirta (New Advent)