Pope Leo XII, Satis Cognitum:
15. “But the Episcopal order is rightly judged to be in communion with Peter, as Christ commanded, if it be subject to and obeys Peter; otherwise it necessarily becomes a lawless and disorderly crowd. It is not sufficient for the due preservation of the unity of the faith that the head should merely have been charged with the office of superintendent, or should have been invested solely with a power of direction. But it is absolutely necessary that he should have received real and sovereign authority which the whole community is bound to obey.”

Pope Saint Pius X:
“Therefore, when one loves the Pope, there is no discussion about what he disposes or demands, or how far obedience must go, and in what things one must obey; when one loves the Pope, one does not say that he did not speak clearly enough, as if he were obliged to repeat in the ear of everyone that clearly expressed will many times, not only verbally, but with letters and other public documents…”

“his orders are not questioned, citing the easy pretext of those who do not want to obey, that it is not the Pope who commands, but those who surround him; the field in which he can and must exercise his authority is not limited. The authority of the Pope is not preceded by that of other people, however learned, who disagree with the Pope, who, if they are learned, are not saints, because whoever is holy cannot disagree with the Pope.” [Pius X, Speech, 18 November 1912.]

Vatican I, Pastor Aeternus, chapter 3:
“8. Since the Roman Pontiff, by the divine right of the Apostolic primacy, governs the whole Church, we likewise teach and declare that he is the supreme judge of the faithful, and that in all cases which fall under ecclesiastical jurisdiction recourse may be had to his judgment. The sentence of the Apostolic See (than which there is no higher authority) is not subject to revision by anyone, nor may anyone lawfully pass judgment thereupon. And so they stray from the genuine path of truth who maintain that it is lawful to appeal from the judgments of the Roman Pontiffs to an Ecumenical Council as if this were an authority superior to the Roman Pontiff.”

Pope Pius XII, Mystical Body of Christ, 40:
“But we must not think that He rules only in a hidden or extraordinary manner. On the contrary, our Redeemer also governs His Mystical Body in a visible and normal way through His Vicar on earth. You know, Venerable Brethren, that after He had ruled the ‘little flock’ Himself during His mortal pilgrimage, Christ our Lord, when about to leave this world and return to the Father, entrusted to the Chief of the Apostles the visible government of the entire community He had founded. Since He was all wise He could not leave the body of the Church He had founded as a human society without a visible head. Nor against this may one argue that the primacy of jurisdiction established in the Church gives such a Mystical Body two heads. For Peter in view of his primacy is only Christ’s Vicar; so that there is only one chief Head of this Body, namely Christ, who never ceases Himself to guide the Church invisibly, though at the same time He rules it visibly, through him who is His representative on earth. After His glorious Ascension into Heaven this Church rested not on Him alone, but on Peter, too, its visible foundation stone. That Christ and His Vicar constitute one only Head is the solemn teaching of Our predecessor of immortal memory Boniface VIII in the Apostolic Letter Unam Sanctam; and his successors have never ceased to repeat the same.”

Vatican II, Lumen Gentium:
22. “But the college or body of bishops has no authority unless it is understood together with the Roman Pontiff, the successor of Peter as its head. The pope’s power of primacy over all, both pastors and faithful, remains whole and intact. In virtue of his office, that is as Vicar of Christ and pastor of the whole Church, the Roman Pontiff has full, supreme and universal power over the Church. And he is always free to exercise this power. The order of bishops, which succeeds to the college of apostles and gives this apostolic body continued existence, is also the subject of supreme and full power over the universal Church, provided we understand this body together with its head the Roman Pontiff and never without this head. This power can be exercised only with the consent of the Roman Pontiff. For our Lord placed Simon alone as the rock and the bearer of the keys of the Church, and made him shepherd of the whole flock….”

Pope Francis: “The Gentle and merciful Jesus, the Shepherd of our Souls, entrusted to the Apostle Peter and to his successors the power of the keys to carry out the work of truth and justice in the Church; this supreme and universal power of binding and loosing here on earth asserts, strengthens, and protects the power of Pastors of particular Churches, by virtue of which they have the sacred right and duty before the Lord to enact judgment toward those entrusted to their care.”