Ch. 6. That they who are at Rome do not observe those things in all cases which have been handed down from the beginning, and vainly pretend the authority of the Apostles, any one may know; also, from the fact that concerning the celebration of the day of Easter, and concerning many other sacraments of divine matters, one may see that there are some diversities among them, and that all things are not observed there alike which are observed at Jerusalem; just as in very many other provinces also many things are varied because of the difference of places and names, yet on this account there is no departure at all from the peace and unity of the Catholic Church. And this departure Stephen has now dared to make; breaking the peace against you, which his predecessors have always kept with you in mutual love and honor, even herein defaming Peter and Paul, the blessed Apostles, as if the very men delivered this who in their epistles execrated heretics and warned us to avoid them. Whence it appears that this tradition is human which maintains heretics, and asserts that they have baptism, which belongs to the Church alone.
Ch. 17. And in this respect I am justly indignant at this so open and manifest folly of Stephen, that he who so boasts of the place of his episcopate and contends that he holds the succession of Peter, on whom the foundation of the Church was laid, should introduce many other rocks and establish new buildings of many churches, maintaining that there is a baptism in them by his authority; for those who are baptized, without doubt, make up the number of the Church.… Stephen, who announces that he holds by succession the throne of Peter, is stirred with no zeal against heretics, when he concedes to them, not a moderate, but the very greatest power of grace.
Ch. 19. This, indeed, you Africans are able to say against Stephen, that when you knew the truth you forsook the error of custom. But we join custom to truth, and to the Romans’ custom we oppose custom, but the custom of truth, holding from the beginning that which was delivered by Christ and the Apostles. Nor do we remember that this at any time began among us, since it has always been observed here, that we have known none but one Church of God, and have accounted no baptism holy except that of the holy Church.