Now not only the most ancient Fathers, as Irenaeus, Tertullian, and Cyprian, but the whole body of them, assign the origin of this to Peter. This they make the vivifying principle of agreement, society and unity, without which the Church can neither be intrinsically Catholic, nor the mind conceive it as such. It is so stated by [126]Pacian, [127]Ambrose, the [128]Fathers of Aquileia, [129] Optatus, [130]Gregory Nazianzen, [131]Jerome, [132]Augustine, [133] Gelasius, [134]Hormisdas, [135]Agatho, [136]Maximus Martyr, and, to shorten the list, by Leo[137] the Great. It is in setting forth the unity of the Catholic episcopate that he writes what ought never to be forgotten by Christian minds: "For the compactness of our unity cannot remain firm, unless the bond of charity weld us into an inseparable whole, because, as we have many members in one body, and all members have not the same office, so we, being many, are one body in Christ, and every one members one of another. For it is the connection of the whole body which makes one soundness and one beauty; and this connexion, as it requires unanimity in the whole body, so especially demands concord among bishops. For though these have a like dignity, yet have they not an equal jurisdiction; since even among the most blessed Apostles, as there was a likeness of honour, so was there a certain distinction of power, and the election of all being equal, pre-eminence over the rest was given to one, from which mould, or type, the distinction also between bishops has arisen, and it was provided by a great ordering, that all should not claim to themselves all things, but that in every province there should be one whose sentence should be considered the first among his brethren; and others again, seated in the greater cities, should undertake a larger care, through whom the direction of the universal Church should converge to the one See of Peter, and nothing anywhere disagree from its head."