25 Then he addresses to him these powerful words: "Who art thou.? Thou art the High Priest and the Sovereign Pontiff. Thou art the prince of pastors and the heir of the apostles . . . by thy jurisdiction, a Peter; and by thy unction, a Christ. Thou art he to whom the keys have been delivered and the sheep entrusted. There are indeed other gate-keepers of heaven, and there are other shepherds of the flock; but thou art in both respects more glorious than they in proportion as thou hast inherited a more excellent name. They have assigned to them particular portions of the flock, his own to each; whereas thou art given charge of all the sheep, as the one Chief Shepherd of the whole flock. Yea, not only of the sheep, but of the other pastors also art thou the sole supreme Shepherd." And again: "He who wishes to discover something which does not belong to thy charge, will have to go outside the world."
Source: Doctor Mellifluus (Vatican.va)