Ad Sinarum Gentem §12

¹² By virtue of God's Will, the faithful are divided into two classes: the clergy and the laity. By virtue of the same Will is established the twofold sacred hierarchy, namely, of orders and jurisdiction. Besides - as has also been divinely established - the power of orders (through which the ecclesiastical hierarchy is composed of Bishops, priests, and ministers) comes from receiving the Sacrament of Holy Orders. But the power of jurisdiction, which is conferred upon the Supreme Pontiff directly by divine rights, flows to the Bishops by the same right, but only through the Successor of St. Peter, to whom not only the simple faithful, but even all the Bishops must be constantly subject, and to whom they must be bound by obedience and with the bond of unity.