2.

And they say that in this matter they follow ancient custom; ¹ although among the ancients these were as yet the first beginnings of heresy and schisms, so that those were involved in them who departed from the Church, having first been baptized therein; and these, therefore, when they returned to the Church and repented, it was not necessary to baptize. Which also we observe in the present day, that it is sufficient to lay hands for repentance upon those who are known to have been baptized in the Church, and have gone over from us to the heretics, if, subsequently acknowledging their sin and putting away their error, they return to the truth and to their parent; so that, because it had been a sheep, the Shepherd may receive into His fold the estranged and vagrant sheep. But if he who comes from the heretics has not previously been baptized in the Church, but comes as a stranger and entirely profane, he must be baptized, that he may become a sheep, because in the holy Church is the one water which makes sheep. And therefore, because there can be nothing common to falsehood and truth, to darkness and light, to death and immortality, to Antichrist and Christ, we ought by all means to maintain the unity of the Catholic Church, and not to give way to the enemies of faith and truth in any respect.