In the transmission of that Power to the persons to whom He gave it He observed two principles: that of unity, and that of hierarchical subordination. To maintain the first, He made the Primacy; to maintain the second, the College of Apostles. For the whole of this triple power, the keys of the kingdom of heaven in the priesthood, the guardianship of faith in the office of teacher, and the supreme pastorship of rule He promised to one and bestowed on one, Peter. Thus He made Peter the Primate, and by the centering this triple authority in his sole person set him as the Rock on which the Church is built. At the same time He associated with Peter the eleven, to exercise this same authority in conjunction with Him. Thus at the very founding of the Church we find the two forces which are to continue throughout, and from the union of which the whole hierarchy with its graduated subordination springs. From the Apostolic College descends the Episcopate, the everliving source of which is in Peter the head, by union with whom it is "one Episcopate, of which a part is held by each without division of the whole." Only on this condition is the Episcopate one, without which, in all places and in all time, it would be a principle of rivalry and division, using the triple power of priesthood, teaching, and rule against itself. With this condition we have exactly realised the image of the Rock on which the Church is founded, and against which the gates of hell shall not prevail, in the establishment of the Episcopate, as one indivisible power, having its fountain and fulness in one person, a part of whose solicitude is shared by a body of bishops spread through the whole world, speaking with one voice the faith of Peter, because they are united with the person of Peter.