“If cases of greater importance are to be heard [at a council], they are, as the synod decrees and as happy custom requires, after episcopal judgment, to be referred to the Apostolic See” (Letters 2:3:6 [A.D. 408]).
“In seeking the things of God… following the examples of ancient tradition… you have strengthened… the vigor of your religion with true reason, for you have acknowledged that judgment is to be referred to us, and have shown that you know what is owed to the Apostolic See, if all of us placed in this position are to desire to follow the apostle himself [Peter] from whom the episcopate itself and the total authority of this name have emerged. Following him, we know how to condemn evils just as well as we know how to approve what is laudable. Or rather, guarding with your priestly office what the Fathers instituted, you did not regard what they had decided, not by human but by divine judgments, as something to be trampled on. They did not regard anything as finished, even though it was the concern of distant and remote provinces, until it had come to the notice of this See [Rome], so that what was a just pronouncement might be confirmed by the authority of this See, and thence other churches—just as all waters proceed from their own natal source and, through the various regions of the whole world, remain pure liquids of an uncorrupted head…” (ibid., 29:1).