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  Pastor Aeternus  

Apostolic Constitution on the Church

Pastor Aeternus

18 July 1870



  medallions of popes in Notre Dame de Paris   Pius IX's medallion in Notre Dame de Paris among those of the college of Popes  
  In Notre Dame de Paris      


    Pastor Aeternus in the original Latin





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.

      Chapter 3 Paragraph 8 [emphasis added]




First dogmatic constitution on the Church of Christ

Pius, bishop, servant of the servants of God,

with the approval of the Sacred Council,

for an everlasting record.


1. The eternal shepherd and guardian of our souls [37], in order to render permanent the saving work of redemption, determined to build a Church in which, as in the house of the living God, all the faithful should be linked by the bond of one faith and charity.

2. Therefore, before he was glorified, he besought his Father, not for the apostles only, but also for those who were to believe in him through their word, that they all might be one as the Son himself and the Father are one [38].

3. So then, just as he sent apostles, whom he chose out of the world [39], even as he had been sent by the Father [40], in like manner it was his will that in his Church there should be shepherds and teachers until the end of time.

4. In order, then, that the episcopal office should be one and undivided and that, by the union of the clergy, the whole multitude of believers should be held together in the unity of faith and communion, he set blessed Peter over the rest of the apostles and instituted in him the permanent principle of both unities and their visible foundation.

5. Upon the strength of this foundation was to be built the eternal temple, and the Church whose topmost part reaches heaven was to rise upon the firmness of this foundation [41].

6. And since the gates of hell trying, if they can, to overthrow the Church, make their assault with a hatred that increases day by day against its divinely laid foundation, we judge it necessary, with the approbation of the Sacred Council, and for the protection, defense and growth of the Catholic flock, to propound the doctrine concerning the 1. institution, 2. permanence and 3. nature of the sacred and apostolic primacy, upon which the strength and coherence of the whole Church depends.

7. This doctrine is to be believed and held by all the faithful in accordance with the ancient and unchanging faith of the whole Church.

8. Furthermore, we shall proscribe and condemn the contrary errors which are so harmful to the Lord's flock.

  Chapter 1 — On the institution of the apostolic primacy in blessed Peter  

1. We teach and declare that, according to the gospel evidence, a primacy of jurisdiction over the whole Church of God was immediately and directly promised to the blessed apostle Peter and conferred on him by Christ the lord.

2. It was to Simon alone, to whom he had already said You shall be called Cephas [42], that the Lord, after his confession, You are the Christ, the son of the living God, spoke these words:

Blessed are you, Simon Bar-Jona. For flesh and blood has not revealed this to you, but my Father who is in heaven. And I tell you, you are Peter, and on this rock I will build my Church, and the gates of the underworld shall not prevail against it. I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven [43] .

3. And it was to Peter alone that Jesus, after his resurrection, confided the jurisdiction of Supreme Pastor and ruler of his whole fold, saying:
Feed my lambs, feed my sheep [44].

4. To this absolutely manifest teaching of the Sacred Scriptures, as it has always been understood by the Catholic Church, are clearly opposed the distorted opinions of those who misrepresent the form of government which Christ the lord established in his Church and deny that Peter, in preference to the rest of the apostles, taken singly or collectively, was endowed by Christ with a true and proper primacy of jurisdiction.

5. The same may be said of those who assert that this primacy was not conferred immediately and directly on blessed Peter himself, but rather on the Church, and that it was through the Church that it was transmitted to him in his capacity as her minister.

6. Therefore, 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 honor 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.

  Chapter 2 — On the permanence of the primacy of blessed Peter in the Roman pontiffs  

1. That which our lord Jesus Christ, the prince of shepherds and great shepherd of the sheep, established in the blessed apostle Peter, for the continual salvation and permanent benefit of the Church, must of necessity remain for ever, by Christ's authority, in the Church which, founded as it is upon a rock, will stand firm until the end of time [45].

2. For no one can be in doubt, indeed it was known in every age that the holy and most blessed Peter, prince and head of the apostles, the pillar of faith and the foundation of the Catholic Church, received the keys of the kingdom from our lord Jesus Christ, the savior and redeemer of the human race, and that to this day and for ever he lives and presides and exercises judgment in his successors the bishops of the Holy Roman See, which he founded and consecrated with his blood [46].

3. Therefore whoever succeeds to the chair of Peter obtains by the institution of Christ himself, the primacy of Peter over the whole Church. So what the truth has ordained stands firm, and blessed Peter perseveres in the rock-like strength he was granted, and does not abandon that guidance of the Church which he once received [47].

4. For this reason it has always been necessary for every Church--that is to say the faithful throughout the world--to be in agreement with the Roman Church because of its more effective leadership. In consequence of being joined, as members to head, with that see, from which the rights of sacred communion flow to all, they will grow together into the structure of a single body [48].

5. Therefore, if anyone says that it is not by the institution of Christ the lord himself (that is to say, 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.

  Chapter 3 — On the power and character of the primacy of the Roman Pontiff  

1. And so, supported by the clear witness of Holy Scripture, and adhering to the manifest and explicit decrees both of our predecessors the Roman Pontiffs and of general councils, we promulgate anew the definition of the ecumenical Council of Florence [49], which must be believed by all faithful Christians, namely that the Apostolic See and the Roman Pontiff hold a world-wide primacy, and that the Roman Pontiff is the successor of blessed Peter, the prince of the apostles, true vicar of Christ, head of the whole Church and father and teacher of all Christian people.

To him, in blessed Peter, full power has been given by our lord Jesus Christ to tend, rule and govern the universal Church.

All this is to be found in the acts of the ecumenical councils and the sacred canons.

  2. Wherefore we teach and declare that, by divine ordinance, the Roman Church possesses a pre-eminence of ordinary power over every other Church, and that this jurisdictional power of the Roman Pontiff is both episcopal and immediate. Both clergy and faithful, of whatever rite and dignity, both singly and collectively, are bound to submit to this power by the duty of hierarchical subordination and true obedience, and this not only in matters concerning faith and morals, but also in those which regard the discipline and government of the Church throughout the world.  
  3. In this way, by unity with the Roman Pontiff in communion and in profession of the same faith , the Church of Christ becomes one flock under one Supreme Shepherd [50].  
  4. This is the teaching of the Catholic truth, and no one can depart from it without endangering his faith and salvation.  
  5. This power of the Supreme Pontiff by no means detracts from that ordinary and immediate power of episcopal jurisdiction, by which bishops, who have succeeded to the place of the apostles by appointment of the Holy Spirit, tend and govern individually the particular flocks which have been assigned to them. On the contrary, this power of theirs is asserted, supported and defended by the Supreme and Universal Pastor; for St. Gregory the Great says: "My honor is the honor of the whole Church. My honor is the steadfast strength of my brethren. Then do I receive true honor, when it is denied to none of those to whom honor is due." [51]  
  6. Furthermore, it follows from that supreme power which the Roman Pontiff has in governing the whole Church, that he has the right, in the performance of this office of his, to communicate freely with the pastors and flocks of the entire Church, so that they may be taught and guided by him in the way of salvation.  
  7. And therefore we condemn and reject the opinions of those who hold that this communication of the Supreme Head with pastors and flocks may be lawfully obstructed; or that it should be dependent on the civil power, which leads them to maintain that what is determined by the Apostolic See or by its authority concerning the government of the Church, has no force or effect unless it is confirmed by the agreement of the civil authority.  
  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 [52], and that in all cases which fall under ecclesiastical jurisdiction recourse may be had to his judgment [53]. 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 [54]. 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.  

9. 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.

  Chapter 4 — On the infallible teaching authority of the Roman Pontiff  

1. That apostolic primacy which the Roman Pontiff possesses as successor of Peter, the prince of the apostles, includes also the supreme power of teaching. This Holy See has always maintained this, the constant custom of the Church demonstrates it, and the ecumenical councils, particularly those in which East and West met in the union of faith and charity, have declared it.

2. So the fathers of the fourth Council of Constantinople, following the footsteps of their predecessors, published this solemn profession of faith: The first condition of salvation is to maintain the rule of the true faith. And since that saying of our lord Jesus Christ, You are Peter, and upon this rock I will build my Church [55], cannot fail of its effect, the words spoken are confirmed by their consequences. For in the Apostolic See the Catholic religion has always been preserved unblemished, and sacred doctrine been held in honor. Since it is our earnest desire to be in no way separated from this faith and doctrine, we hope that we may deserve to remain in that one communion which the Apostolic See preaches, for in it is the whole and true strength of the Christian religion [56].

What is more, with the approval of the second Council of Lyons, the Greeks made the following profession:
"The Holy Roman Church possesses the supreme and full primacy and principality over the whole Catholic Church. She truly and humbly acknowledges that she received this from the Lord himself in blessed Peter, the prince and chief of the apostles, whose successor the Roman Pontiff is, together with the fullness of power. And since before all others she has the duty of defending the truth of the faith, so if any questions arise concerning the faith, it is by her judgment that they must be settled." [57]

Then there is the definition of the Council of Florence:

"The Roman Pontiff is the true vicar of Christ, the head of the whole Church and the father and teacher of all Christians; and to him was committed in blessed Peter, by our lord Jesus Christ, the full power of tending, ruling and governing the whole Church." [58]

3. To satisfy this pastoral office, our predecessors strove unwearyingly that the saving teaching of Christ should be spread among all the peoples of the world; and with equal care they made sure that it should be kept pure and uncontaminated wherever it was received.

4. It was for this reason that the bishops of the whole world, sometimes individually, sometimes gathered in synods, according to the long established custom of the Churches and the pattern of ancient usage referred to this Apostolic See those dangers especially which arose in matters concerning the faith. This was to ensure that any damage suffered by the faith should be repaired in that place above all where the faith can know no failing [59].

5. The Roman pontiffs, too, as the circumstances of the time or the state of affairs suggested, sometimes by summoning ecumenical councils or consulting the opinion of the Churches scattered throughout the world, sometimes by special synods, sometimes by taking advantage of other useful means afforded by divine providence, defined as doctrines to be held those things which, by God's help, they knew to be in keeping with Sacred Scripture and the apostolic traditions.

6. For the Holy Spirit was promised to the successors of Peter not so that they might, by his revelation, make known some new doctrine, but that, by his assistance, they might religiously guard and faithfully expound the revelation or deposit of faith transmitted by the apostles.

Indeed, their apostolic teaching was embraced by all the venerable fathers and reverenced and followed by all the holy orthodox doctors, for they knew very well that this See of St. Peter always remains unblemished by any error, in accordance with the divine promise of our Lord and Savior to the prince of his disciples: I have prayed for you that your faith may not fail; and when you have turned again, strengthen your brethren [60].

7. This gift of truth and never-failing faith was therefore divinely conferred on Peter and his successors in this See so that they might discharge their exalted office for the salvation of all, and so that the whole flock of Christ might be kept away by them from the poisonous food of error and be nourished with the sustenance of heavenly doctrine. Thus the tendency to schism is removed and the whole Church is preserved in unity, and, resting on its foundation, can stand firm against the gates of hell.

8. But since in this very age when the salutary effectiveness of the apostolic office is most especially needed, not a few are to be found who disparage its authority, we judge it absolutely necessary to affirm solemnly the prerogative which the only-begotten Son of God was pleased to attach to the supreme pastoral office.

9. Therefore, faithfully adhering to the tradition received from the beginning of the Christian faith, to the glory of God our savior, for the exaltation of the Catholic religion and for the salvation of the Christian people, with the approval of the Sacred Council, 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.

Given at Rome in public session, solemnly held in the Vatican Basilica in the year of our Lord one thousand eight hundred and seventy, on the eighteenth day of July, in the twenty-fifth year of Our Pontificate.

In conformity with the original.

Joseph, Bishop of St. Polten Secretary to the Vatican Council



37 1 Pt 2,25.

38 Jn 17, 20-21.

39 Jn 15, 19.

40 Jn 20, 21.

41 Leo 1, Serm. (Sermons), 4 (elsewhere 3), ch. 2 for the day of his birth (PL 54, 150).

42 Jn 1, 42.

43 Mt 16, 16 19.

44 Jn 21, 15-17.

45 See Mt 7, 25; Lk 6, 48.

46 From the speech of Philip, the Roman legate, at the 3rd session of the Council of Ephesus (D no. 112).

47 Leo I, Serm. (Sermons), 3 (elsewhere 2), ch. 3 (PL 54, 146).

48 Irenaeus, Adv. haeres. (Against Heresies) 1113 (PG 7, 849), Council of Aquilea (381), to be found among: Ambrose, Epistolae (Letters), 11 (PL 16, 946).

49 Council of Florence, session 6 (see above p. 528).

50 See Jn 10, 16.

51 Ep. ad Eulog. Alexandrin. (Letter to Eulogius of Alexandria), VIII 29 (30) (MGH, Ep. 2, 31 28-30, PL 77, 933).

52 Pius VI, Letter Super soliditate dated 28 Nov. 1786.

53 From Michael Palaeologus's profession of faith which was read out at the second Council of Lyons (D no. 466).

54 Nicholas I, Ep. ad Michaelem imp. (Letter to the emperor Michael) (PL 119, 954).

55 Mt 16, 18.

56 From Pope Hormisdas's formula of the year 517 (D no. 171), see above p. 157 n. 1.

57 From Michael Palaeologus's profession of faith which was read out at the second Council of Lyons (D no. 466).

58 Council of Florence, session 6 (see above p. 528). S Bernard, Ep. (Letters) 190 (PL 182, 1053).

59 Bernard, Ep. (Letters) 190 (PL 182, 1053).

60 Lk 22, 32.





Constitutio Dogmatica Pastor Aeternus

Pius Episcopus Servus Servorum Dei

Sacro approbante Concilio

Ad perpetuam rei memoriam


Pastor aeternus et episcopus animarum nostrarum, ut salutiferum redemptionis opus perenne redderet, sanctam aedificare Ecclesiam decrevit, in qua veluti in domo Dei viventis fideles omnes unius fidei et charitatis vinculo contuerentur. Quapropter, priusquam clarificaretur, rogavit Patrem non pro Apostolis tantum, sed et pro eis, qui credituri erant per verbum eorum in ipsum, ut omnes unum essent, sicut ipse Filius et Pater unum sunt. Quemadmodum igitur Apostolos, quos sibi de mundo elegerat, misit, sicut ipse missus erat a Patre: ita in Ecclesia sua Pastores et Doctores usque ad consummationem saeculi esse voluit. Ut vero episcopatus ipse unus et indivisus esset, et per cohaerentes sibi invicem sacerdotes credentium multitudo universa in fidei et communionis unitate conservaretur, beatum Petrum ceteris Apostolis praeponens in ipso instituit perpetuum utriusque unitatis principium ac visibile fundamentum, super cuius fortitudinem aeternum exstrueretur templum, et Ecclesiae coelo inferenda sublimitas in huius fidei firmitate consurgeret (1). Et quoniam portae inferi ad evertendam, si fieri posset, Ecclesiam contra eius fundamentum divinitus positum maiori in dies odio undique insurgunt; Nos ad catholici gregis custodiam, incolumitatem, augmentum, necessarium esse iudicamus, sacro approbante Concilio, doctrinam de institutione, perpetuitate, ac natura sacri Apostolici primatus, in quo totius Ecclesiae vis ac soliditas consistit, cunctis fidelibus credendam et tenendam, secundum antiquam atque constantem universalis Ecclesiae fidem, proponere, atque contrarios, dominico gregi adeo perniciosos errores proscribere et condemnare.

(1) S. Leo M. serro. IV (al. III) cap. 2 io diem Natalis sui.




Docemus itaque et declaramus, iuxta Evangelii testimonia primatum iurisdictionis in universam Dei Ecclesiam immediate et directe beato Petro Apostolo promissum atque collatum a Christo Domino fuisse. Unum enim Simonem, cui iam pridem dixerat: Tu vocaberis Cephas (1), postquam ille suam edidit confessionem inquiens Tu es Christus, Filius Dei vivi, solemnibus his verbis allocutus est Dominus: Beatus es Simon Bar-Iona; quia caro, et sanguis non revelavit tibi, sed Pater meus, qui in cöelis est: et ego dico tibi, quia tu es Petrus, et super hanc petram aedificabo Ecclesiam meam, et portae inferi non praevalebunt adversus eam: et tibi dabo claves regni coelorum: et quodcumque ligaveris super terram erit ligatum et in coelis: et quodcumque solveris super terram, erit solutum et in coelis (2). Atque uni Simoni Petro contulit Iesus post suam resurrectionem summi pastoris et rectoris iurisdictionem in totum suum ovile, dicens: Pasce agnos meos: Pasce oves meas (3). Huic tam manifestae sacrarum Scripturarum doctrinae, ut ab Ecclesia catholica semper intellecta est, aperte opponuntur pravae eorum sententiae, qui constitutam a Christo Domino in sua Ecclesia regiminis formam pervertentes negant, solum Petrum prae ceteris Apostolis, sive seorsum singulis sive omnibus simul, vero proprioque iurisdictionis primatu fuisse a Christo instructum; aut qui affirmant, eundem primatum non immediate, directeque ipsi beato Petro, sed Ecclesiae, et per hanc illi ut ipsius Ecclesiae ministro delatum fuisse.

Si quis igitur dixerit, beatum Petrum Apostolum non esse a Christo Domino constitutum Apostolorum omnium principem et totius Ecclesiae militantis visibile caput; vel eundem honoris tantum, non autem verae propriaeque iurisdictionis primatum ab eodem Domino nostro Iesu Christo directe et immediate accepisse; anathema sit.

(1) Ioan. I, 42.

(2) Matth. XVI, 16-19.

(3) Ioan. XXI, 15-17.




Quod autem in beato Apostolo Petro princeps pastorum et pastor magnus ovium Dominus Christus Iesus in perpetuam salutem ac perenne bonum Ecclesiae instituit, id eodem auctore in Ecclesia, quae fundata super petram ad finem saeculorum usque firma stabit, iugiter durare necesse est. Nulli sane dubium, imo saeculis omnibus notum est, quod sanctus beatissimusque Petrus, Apostolorum princeps et caput, fideique columna et Ecclesiae catholicae fundamentum, a Domino nostro Iesu Christo, Salvatore humani generis ac Redemptore, claves regni accepit: qui ad hoc usque tempus et semper in suis successoribus, episcopis sanctae Romanae Sedis, ab ipso fundatae, eiusque consecratae sanguine, vivit et praesidet et iudicium exercet (1). Unde quicumque in hac Cathedra Petro succedit, is secundum Christi ipsius institutionem primatum Petri in universam Ecclesiam obtinet. Manet ergo dispositio veritatis, et beatus Petrus in accepta fortitudine petrae perseverans suscepta Ecclesiae gubernacula non reliquit (2). Hac de causa ad Romanam Ecclesiam propter potentiorem principalitatem necesse semper fuit omnem convenire Ecclesiam, hoc est, eos, qui sunt undique fideles, ut in ea Sede, e qua venerandae communionis iura in omnes dimanant, tamquam membra in capite consociata, in unam corporis compagem coalesceret (3).

Si quis ergo dixerit, non esse ex ipsius Christi Domini institutione seu iure divino, ut beatus Petrus in primatu super universam Ecclesiam habeat perpetuos successores; aut Roma num Pontificem non esse beati Petri in eodem primatu successorem; anathema sit.

(1) Cf. Ephesini Concilii Act. III.

(2) S. Leo M. Serra. III (al. II) cap. 3.

(3) S. Iren. Adv. haer. I. III c. 3, et Conc. Aquiiei. a. 381 inter opp. S. Ambr. ep. XL.




Quapropter apertis innixi sacrarum litterarum testimoniis, et inhaerentes tum Praedecessorum Nostrorum, Romanorum Pontificum, tum Conciliorum generalium disertis, perspicuisque decretis, innovamus oecumenici Concilii Florentini definitionem, qua credendum ab omnibus Christi fidelibus est, sanctam Apostolicam Sedem, et Romanum Pontificem in universum orbem tenere primatum, et ipsum Pontificem Romanum successorem esse beati Petri principis Apostolorum, et verum Christi Vicarium, totiusque Ecclesiae caput, et omnium Christianorum patrem ac doctorem existere; et ipsi in beato Petro pascendi, regendi ac gubernandi universalem Ecclesiam a Domino nostro Iesu Christo plenam potestatem traditam esse; quemadmodum etiam in gestis oecumenicorum Conciliorum et in sacris canonibus continetur.

Docemus proinde et declaramus, Ecclesiam Romanam, disponente Domino, super omnes alias ordinariae potestatis obtinere principatum, et hanc Romani Pontificis iurisdictionis potestatem, quae vere episcopalis est, immediatam esse: erga quam cuiuscumque ritus et dignitatis pastores atque fideles, tam seorsum singuli quam simul omnes, officio hierarchicae subordinationis, veraeque obedientiae obstringuntur, non solum in rebus, quae ad fidem et mores, sed etiam in iis, quae ad disciplinam et regimen ecclesiae per totum orbem diffusae pertinent; ita ut custodita cum Romano Pontifice tam communionis, quam eiusdem fidei professionis unitate, Ecclesia Christi sit unus grex sub uno summo pastore. Haec est catholicae veritatis doctrina, a qua deviare salva fide atque salute nemo potest.

Tantum autem abest, ut haec Summi Pontificis potestas officiat ordinariae ac immediatae illi episcopalis iurisdictionis potestati, qua Episcopi, qui positi a Spiritu Sancto in Apostolorum locum successerunt, tamquam veri pastores assignatos sibi greges, singuli singulos, pascunt et regunt, ut eadem a supremo et universali Pastore asseratur, roboretur ac vindicetur, secundum illud sancti Gregorii Magni: meus honor est honor universalis Ecclesiae.

Meus honor est fratrum meorum solidus vigor. Tum ego vere honoratus sum, cum singulis quibusque honor debitus non negatur (1). Porro ex suprema illa Romani Pontificis potestate gubernandi universam Ecclesiam ius eidem esse consequitur, in huius sui muneris exercitio libere communicandi cum pastoribus et gregibus totius Ecclesiae, ut iidem ab ipso in via salutis doceri ac regi possint. Quare damnamus ac reprobamus illorum sententias, qui hanc supremi capitis cum pastoribus et gregibus communicationem licite impediri posse dicunt, aut eandem reddunt saeculari potestati obnoxiam, ita ut contendant, quae ab Apostolica Sede vel eius auctoritate ad regimen Ecclesiae eonstituuntur, vim ac valorem non habere, nisi potestatis saecularis placito confirmentur. Et quoniam divino Apostolici primatus iure Romanus Pontifex universae Ecclesiae praeest, docemus etiam et declaramus, eum esse iudicem supremum fidelium (2), et in omnibus causis ad examen ecclesiasticum spectantibus ad ipsius posse iudicium recurri (3); Sedis vero Apostolicae, cuius auctoritate maior non est, iudicium a nemine fore retractandum, neque cuiquam de eius licere iudicare iudicio (4). Quare a recto veritatis tramite aberrant, qui affirmant, licere ab iudiciis Romanorum Pontificum ad oecumenicum Concilium tamquam ad auctoritatem Romano Pontifice superiorem appellare.

Si quis itaque dixerit, Romanum Pontificem habere tantummodo officium inspectionis vel directionis, non autem plenam et supremam potestatem iurisdictionis in universam Ecclesiam, non solum in rebus, quae ad fidem et mores, sed etiam in iis, quae ad disciplinam et regimen Ecclesiae per totum orbem diffusae pertinent; aut eum habere tantum potiores partes, non vero totam plenitudinem huius supremae potestatis; aut hanc eius potestatem non esse ordinariam et immediatam sive in omnes ac singulas ecclesias, sive in omnes et singulos pastores et fideles; anathema sit.

(1) Ep. ad Eulog. Alexandrin. I. VIII ep. XXX.

(2) Pii PP. VI Breve, Super soliditate d. 28 Nov. 1786.

(3) Concil. Oecum. Lugdun. II.

(4) Ep. Nicolai 1 ad Michaelem Imporatorem.




Ipso autem Apostolico primatu, quem Romanus Pontifex tamquam Petri principis Apostolorum successor in universam Ecclesiam obtinet, supremam quoque magisterii potestatem comprehendi, haec Sancta Sedes semper tenuit, perpetuus Ecclesiae usus comprobat, ipsaque oecumenica Concilia, ea imprimis, in quibus Oriens cum Occidente in fidei charitatisque unionem conveniebat, declaraverunt. Patres enim Concilii Constantinopolitani quarti, maiorum vestigiis inhaerentes, hanc solemnem ediderunt professionem: prima salus est, rectae fidei regulam custodire. Et quia non potest Domini nostri Iesu Christi praetermitti sententia dicentis: Tu es Petrus, et super hanc petram aedificabo Ecclesiam meam, haec, quae dicta sunt, rerum probantur effectibus, quia in Sede Apostolica immaculata est semper catholica reservata religio, et sancta celebrata doctrina. Ab huius ergo fide et doctrina separari minime cupientes, speramus, ut in una communione, quam Sedes Apostolica praedicat, esse mereamur, in qua est integra et vera Christianae religionis soliditas (1). Approbante vero Lugdunensi Concilio secundo, Graeci professi sunt: Sanctam Romanam Ecclesiam summum et plenum primatum et principatum super universam Ecclesiam catholicam obtinere, quem se ab ipso Domino in beato Petro Apostolorum principe sive vertice, cuius Romanus Pontifex est successor, cum potestatis plenitudine recepisse veraciter et humiliter recognoscit; et sicut prae ceteris tenetur fidei veritatem defendere, sic et, si quae de fide subortae fuerint quaestiones, suo debent iudicio definiri. Florentinum denique Concilium definivit: Pontificem Romanum, verum Christi Vicarium, totiusque Ecclesiae caput et omnium Christianorum patrem ac doctorem existere ; et ipsi in beato Petro pascendi, regendi ac gubernandi universalem Ecclesiam a Domino nostro Iesu Christo plenam potestatem traditam esse. Huic pastorali muneri ut satisfacerent, Praedecessores Nostri indefessam semper operam dederunt, ut salutaris Christi doctrina apud omnes terrae populos propagaretur, parique cura vigilarunt, ut, ubi recepta esset, sincera et pura conservaretur. Quocirca totius orbis Antistites nunc singuli, nunc in Synodis congregati, longam ecclesiarum consuetudinem et antiquae regulae formam sequentes, ea praesertim pericula, quae in negotiis fidei emergebant, ad hanc Sedem Apostolicam retulerunt, ut ibi potissimum resarcirentur damna fidei, ubi fides non potest sentire defectum (2).

Romani autem Pontifices, prout temporum et rerum conditio suadebat, nunc convocatis oecumenicis Conciliis aut explorata Ecclesiae per orbem dispersae sententia, nunc per Synodos particulares, nunc aliis, quae divina suppeditabat providentia, adhibitis auxiliis, ea tenenda definierunt, quae sacris Scripturis et apostolicis Traditionibus consentanea Deo adiutore cognoverant. Neque enim Petri successoribus Spiritus Sanctus promissus est, ut eo revelante novam doctrinam patefacerent, sed ut eo assistente traditam per Apostolos revelationem seu fidei depositum sancte custodirent et fideliter exponerent. Quorum quidem apostolicam doctrinam omnes venerabiles Patres amplexi et sancti Doctores orthodoxi venerati atque secuti sunt; plenissime scientes, hanc sancti Petri Sedem ab omni semper errore illibatam permanere, secundum Domini Salvatoris nostri divinam pollicitationem discipulorum suorum principi factam: Ego rogavi pro te, ut non deficiat fides tua, et tu aliquando conversus confirma fratres tuos. Hoc igitur veritatis et fidei numquam deficientis charisma Petro eiusque in hac Cathedra successoribus divinitus collatum est, ut excelso suo munere in omnium salutem fungerentur, ut universus Christi grex per eos ab erroris venenosa esca aversus, coelestis doctrinae pabulo nutriretur, ut sublata schismatis occasione Ecclesia tota una conservaretur, atque suo fundamento innixa firma adversus inferi portas consisteret. At vero cum hac ipsa aetate, qua salutifera Apostolici muneris efficacia vel maxime requiritur, non pauci inveniantur, qui illius auctoritati obtrectant; necessarium omnino esse censemus, praerogativam, quam unigenitus Dei Filius cum summo pastorali officio coniungere dignatus est, solemniter asserere.

Itaque Nos traditioni a fidei Christianae exordio perceptae fideliter inhaerendo, ad Dei Salvatoris nostri gloriam, religionis Catholicae exaltationem et Christianorum populorum salutem, sacro approbante Concilio, docemus et divinitus revelatum dogma esse definimus: Romanum Pontificem, cum ex Cathedra loquitur, id est, cum omnium Christianorum Pastoris et Doctoris munere fungens, pro suprema sua Apostolica auctoritate doctrinam de fide vel moribus ab universa Ecclesia tenendam definit, per assistentiam divinam, ipsi in beato Petro promissam, ea infallibilitate pollere, qua divinus Redemptor Ecclesiam suam in definienda doctrina de fide vel moribus instructam esse voluit; ideoque eiusmodi Romani Pontificis definitiones ex sese, non autem ex consensu Ecclesiae irreformabiles esse.

Si quis autem huic Nostrae definitioni contradicere, quod Deus avertat, praesumpserit; anathema sit.

(1) Ex formula S. Hormisdae Papae prout ab Hadriano II Patribus Concili oecumenici Constantinopolitani IV proposita et ab iisdem subscripta est.

(2) Cf. S. Bern. Epist. CXC.



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bronze statute of Saint Peter Arnolfo di Cambio in Saint Peters Basilica

possibly by Arnolfo di Cambio (c. 1240 – 1300)

In Saint Peter's Basilica Peter enthroned and medallion of Pope Pius IX

Medalion of Pius IX

Basilica Sancti Petri




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