Ecclesiae Fastos §10

¹⁰ The success of the apostle was reported to Our predecessor already mentioned, who called him to Rome, and despite the protest of his modesty, "intimated his desire to raise him to the Episcopate, in order that he could with greater firmness correct the erring and bring them back to the way of truth, the greater the authority of his apostolic rank; and would be more acceptable to all in his office of preaching, the more evident it should be that he had been ordained to it by his apostolic superior."