“Our Lord Jesus Christ… established the worship belonging to the divine religion… But the Lord desired that the sacrament of this gift should pertain to all the apostles in such a way that it might be found principally in the most blessed Peter, the highest of all the apostles. And he wanted his gifts to flow into the entire body from Peter himself, as if from the head, in such a way that anyone who had dared to separate himself from the solidarity of Peter would realize that he was himself no longer a sharer in the divine mystery… [You, my brothers], must realize with us, of course, that the Apostolic See—out of reverence for it, I mean—has on countless occasions been reported to in consultation by bishops even of your own province [Vienne]. And through the appeal of various cases to this see, decisions already made have been either revoked or confirmed, as dictated by long-standing custom” (Letters 10:2-3 [A.D. 445]).
“As for the resolution of the bishops which is contrary to the Nicene decree, in union with your faithful piety, I declare it to be invalid and annul it by the authority of the holy apostle Peter” (ibid., 110).
“If in your view, [Anastasius of Thessalonica], in regard to a matter to be handled and decided jointly with your brothers, their decision was other than what you wanted, then let the entire matter, with a record of the proceedings, be referred to us… Although bishops have a common dignity, they are not all of the same rank. Even among the most blessed apostles, though they were alike in honor, there was a certain distinction of power. All were equal in being chosen [to be apostles], but it was given to one to be preeminent over the others… [So today through the bishops] the care of the universal Church would converge in the one see of Peter, and nothing should ever be at odds with this head” (ibid. 14:11).