25 If, however, those men who were ordained by Hilary, and who have lately become sheep without a shepherd, are disposed to allege Scripture in support of what the blessed Cyprian left in his letters advocating the re-baptization of heretics, I beg them to remember that he did not anathematize those who refused to follow him. At all events, he remained in communion with such as opposed his views. He was content with exhorting them, on account of Novatus and the numerous other heretics then springing up, to receive no one who did not condemn his previous error.
In fact, he thus concludes the discussion of the subject with Stephen, the Roman Pontiff: “These things, dearest brother, I have brought to your knowledge on account of our mutual respect and love unfeigned, believing, as I do, that from the sincerity of your piety and your faith you will approve such things as are alike consonant with piety and true in themselves. But I know that some persons are unwilling to abandon views which they have once entertained, and are averse to a change of purpose; they would rather, without breaking the bond of peace and concord between colleagues, adhere to their own plans, when once they have been adopted.
This is a matter in which we do not force anyone, or lay down a law for anyone; let each follow his own free choice in the administration of the Church: let each be ruler in his own sphere since he must give account of his action to the Lord.” In the letter also to Jubaianus on the re-baptization of heretics, towards the end, he says this: “I have written these few remarks, my dearest brother, to the best of my poor ability, without dictating to anyone, or prejudicing the case of anyone: I would not hinder a single bishop from doing what he thinks right with the full exercise of his own judgment.
So far as is possible, we avoid disputes with colleagues and fellow bishops about the heretics, and maintain with them a divine harmony and the Lord's peace, particularly since the Apostle says: 'But if any man seem to be contentious, we have no such custom, neither the churches of God.' With patience and gentleness we preserve charity at heart, the honour of our order, the bond of faith, the harmony of the episcopate.”
Source: The Dialogue Against the Luciferians (New Advent)