Pastor Aeternus #catechesis/library
Church Documents · Catholic Library
[!abstract] (First Vatican Council, Bl. Pius IX, 18 July 1870)
The dogmatic definition of the primacy and infallibility of the Roman Pontiff. What Unam Sanctam (1302) asserted, Pastor Aeternus defines with the full authority of an ecumenical council — 568 years later. The doctrinal capstone of the case for the papacy.
First Vatican Council · First Dogmatic Constitution on the Church of Christ · Rome, 18 July 1870
The constitution has four chapters. The operative definitions (each closed by an anathema):
Ch. 1 — The institution of the apostolic primacy in blessed Peter
If anyone says that blessed Peter the apostle was not appointed by Christ the lord as prince of all the apostles and visible head of the whole church militant; or that it was a primacy of honour only and not one of true and proper jurisdiction that he directly and immediately received from our lord Jesus Christ himself: let him be anathema.
Ch. 2 — The permanence of the primacy of blessed Peter in the Roman pontiffs
If anyone says that it is not by the institution of Christ the lord himself (that is, by divine law) that blessed Peter should have perpetual successors in the primacy over the whole church; or that the Roman pontiff is not the successor of blessed Peter in this primacy: let him be anathema.
Ch. 3 — The power and character of the primacy of the Roman pontiff
So, then, if anyone says that the Roman pontiff has merely an office of supervision and guidance, and not the full and supreme power of jurisdiction over the whole church, and this not only in matters of faith and morals, but also in those which concern the discipline and government of the church dispersed throughout the whole world; or that he has only the principal part, but not the absolute fullness, of this supreme power; or that this power of his is not ordinary and immediate both over all and each of the churches and over all and each of the pastors and faithful: let him be anathema.
Ch. 4 — The infallible teaching authority of the Roman pontiff
…we teach and define as a divinely revealed dogma that when the Roman pontiff speaks EX CATHEDRA, that is, when, in the exercise of his office as shepherd and teacher of all Christians, in virtue of his supreme apostolic authority, he defines a doctrine concerning faith or morals to be held by the whole church, he possesses, by the divine assistance promised to him in blessed Peter, that infallibility which the divine Redeemer willed his church to enjoy in defining doctrine concerning faith or morals. Therefore, such definitions of the Roman pontiff are of themselves, and not by the consent of the church, irreformable.
So then, should anyone, which God forbid, have the temerity to reject this definition of ours: let him be anathema.
[!note] Provenance
Not part of the New Advent Catholic Library — the corpus carries encyclicals but not the Vatican I decrees. Added manually because it completes the papacy through-line that starts at Unam Sanctam. Text is the standard English translation (Norman Tanner, Decrees of the Ecumenical Councils, 1990; = Denzinger 3050–3075); public domain original (1870). Only the operative definitions are reproduced here, not the full four-chapter constitution.
The papacy through-line
- The assertion — Unam Sanctam (Boniface VIII, 1302): “it is absolutely necessary for salvation that every human creature be subject to the Roman Pontiff.“
- The reasoned case — Satis Cognitum (Leo XIII, 1896): the Church rests on Peter as a building on its foundation.
- The prior conciliar witness — Laetentur Caeli (Florence, 1439): the Roman pontiff is “the true vicar of Christ, the head of the whole church.”
- Scriptural root — “Thou art Peter, and upon this rock I will build my church… I will give thee the keys” (Matthew 16:18–19); “Feed my sheep” (John 21:17).
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