34. Irenæus of Ululi said: "If the Church does not baptize a heretic, because it is said that he has been baptized already, then heresy is the greater."

35. The answer is: On the same principle it might be said, If therefore the Church does not baptize the covetous man, because it is said that he has been baptized already, then covetousness is the greater. But this is false, therefore the other is also false.

Chapter 19.—36. Donatus of Cibaliana¹⁸¹³ said: "I acknowledge one Church, and one baptism that appertains thereto. If there is any one who says that the grace of baptism exists among heretics, he must first show and prove that the Church exists with them."¹⁸¹⁴

37. To him we answer: If you say that the grace of baptism is identical with baptism, then it exists among heretics; but if baptism is the sacrament or outward sign of grace, while the grace itself is the abolition of sins, then the grace of baptism does not exist with heretics. But so there is one baptism and one Church, just as there is one faith. As therefore the good and bad, not having one hope, can yet have one baptism, so those who have not one common Church can have one common baptism.

Chapter 20.—38. Zozimus of Tharassa¹⁸¹⁵ said: "When a revelation has been made of the truth, error must give way to truth; inasmuch as Peter also, who before was wont to circumcise, gave way to Paul when he declared the truth."¹⁸¹⁶

39. The answer is: This may also be considered as the expression of our judgment too, and this is just what has been done in respect of this question of baptism. For after that the truth had been more clearly revealed, error gave way to truth, when that most wholesome custom was further confirmed by the authority of a plenary Council. It is well, however, that they so constantly bear in mind that it was possible even for Peter, the chief of the apostles, to have been at one time minded otherwise than the truth required; which we believe, without any disrespect to Cyprian, to have been the case with him, and that with all our love for Cyprian, for it is not right that he should be loved with greater love than Peter.