12. Cease, then, to bring forward against us the authority of Cyprian in favour of repeating baptism, but cling with us to the example of Cyprian for the preservation of unity. For this question of baptism had not been as yet completely worked out, but yet the Church observed the most wholesome custom of correcting what was wrong, not repeating what was already given, even in the case of schismatics and heretics: she healed the wounded part, but did not meddle with what was whole. And this custom, coming, I suppose, from apostolical tradition (like many other things which are held to have been handed down under their actual sanction, because they are preserved throughout the whole Church, though they are not found either in their letters, or in the Councils of their successors),—this most wholesome custom, I say, according to the holy Cyprian, began to be what is called amended by his predecessor Agrippinus. But, according to the teaching which springs from a more careful investigation into the truth, which, after great doubt and fluctuation, was brought at last to the decision of a general Council, we ought to believe that it rather began to be corrupted than to receive correction at the hands of Agrippinus. Accordingly, when so great a question forced itself upon him, and it was difficult to decide the point, whether remission of sins and man's spiritual regeneration could take place among heretics or schismatics, and the authority of Agrippinus was there to guide him, with that of some few men who shared in his misapprehension of this question, having preferred attempting something new to maintaining a custom which they did not understand how to defend; under these circumstances, considerations of probability forced themselves into the eyes of his soul, and barred the way to the thorough investigation of the truth.