Pope Benedict XVI in Zagreb. Image from Wikipedia.

See this online text:

“The Primacy of the Pope and the Unity of the People of God”, by Joseph Cardinal Ratzinger, Communio, vol. 41 (Spring 2014): pp. 112-128. Available in pdf format (here) through this page of Communio.

Posted on the Solemnity of Saint Peter and Saint Paul in the Roman Rite.

“The Roman Pontiff – like all the faithful – is subject to the Word of God, to the Catholic faith, and is the guarantor of the Church’s obedience… He does not make arbitrary decisions, but is spokesman for the will of the Lord, who speaks to man in the Scriptures lived and interpreted by Tradition; in other words, the episkope of the primacy has limits set by divine law and by the Church’s divine, inviolable constitution found in Revelation. The Successor of Peter is the rock which guarantees a rigorous fidelity to the Word of God against arbitrariness and conformism…” (Congregation for the Doctrine of the Faith, The Primacy of the Successor of Peter in the Mystery of the Church, 7)