History, the light of truth, and the witness of the ages, if only it be rightly discerned and diligently examined, teaches us that the divine promise of Jesus Christ: "I am with you all days, even to the consummation of the world" (Matthew xxviii, 20), has never failed the Church His Bride, and therefore that it will never fail her in time to come. Nay, further, the more turbulent the waves by which the divine bark of Peter is tossed, in the course of ages, the more present and powerful is her experience of the help of heavenly grace. This happened more especially in the first age of the Church, not only when the Christian name was regarded as an execrable crime, to be punished by death, but also when the genuine faith of Christ, confounded by the perfidy of the heretics who were spreading, chiefly in the eastern regions, was placed in grave jeopardy. For even as the persecutors of the Catholic name, one after another, perished miserably, and the Roman Empire itself came to ruin, so all the heretics, as withered branches (cf. John xv, 6) torn from the divine vine, could neither drink the sap of life nor bring forth fruit.
2. The Church of God, on the contrary, in the midst of so many storms and the vicissitudes of things that perish, trusting in God alone, has ever gone on her way, with firm, secure steps, and has never ceased from her strenuous defence of the integrity of the sacred deposit of Gospel truth, entrusted to her by her Founder.
3. These things come to our mind, Venerable Brethren, when we are about to speak to you, in these letters, concerning that most auspicious event, namely, the Ecumenical Synod which was held at Ephesus, fifteen hundred years ago; for there, assuredly, the crafty perversity of those who erred was exposed, and there, too, was manifest the most firm faith of the Church upheld by heavenly aid.
4. We know, indeed, that two Committees of distinguished men have been set up, at Our desire, to secure that this centenary commemoration may be worthily celebrated not only here in the city which is the capital of the Catholic world, but also among all nations. (See the letter to the most eminent Cardinals, B. Pompili and A. Sincero, December 25, 1930. Acta Apostolicae Sedis, Vol. XXIII, pp. 10-12). And we are well aware that those to whom we have committed this special office have spared no care and labour and have used every effort to secure its successful accomplishment. These generous efforts have, almost everywhere, met with a willing and spontaneous response, with remarkable unanimity, from both Pastors and people; all which is a matter for heartfelt congratulation, because we are confident that it will prove to be a source of no mean benefits to the cause of Catholicism.
5. But when we carefully consider this event and all the facts and circumstances connected therewith, we feel that it becomes the office commited to Us by God, that We Ourselves should speak with you in these Encyclical Letters concerning this most important matter, before the end of the celebration, and just when we have come again to the sacred season when the Blessed Virgin Mary brought forth our Saviour for us. For We cherish a good hope that not only will these words of ours be pleasing and profitable to you and to your flock; but also that if the same are considered and weighed by some of those who differ from the Apostolic See, brethren and sons most dear to us, moved thereto by the desire of the truth, it may well be that, taught by history the guide of life, they will at least be affected by a longing, or nostalgia, for the one fold and the one Shepherd, and for embracing that genuine faith which is ever preserved safe and whole in the Roman Church. For in the plan which the fathers of the council followed in their attack on the Nestorian heresy, and in the whole celebration of the Ephesian Synod, three dogmas of the Catholic religion, with which we are chiefly concerned here, were luminously manifest to the eyes of all; namely, that there is one person in Jesus Christ and this is Divine; that the Blessed Virgin Mary is to be acknowledged and venerated by all as really and truly the Mother of God; and likewise that in matters of faith and morals, the Roman Pontiff has a God-given authority, supreme, high, and subject to none over all and several faithful Christians.
6. Wherefore, let us pursue the subject in order, taking as our beginning the doctrine and the admonition which the Apostle of the Gentiles addressed to the Ephesians: "Until we all meet into the unity of faith and of the knowledge of the Son of God, unto a perfect man, unto the measure of the age of the fulness of Christ: That henceforth we be no more children tossed to and from, and carried about with every wind of doctrine by the wickedness of men, by cunning craftiness by which they lie in wait to deceive. But doing the truth in charity, we may in all things grow up in Him who is the head, even Christ: From whom the whole body being compacted and fitly joined together, by what ever joint supplieth, according to the operation in the measure of every part, maketh increase of the body unto the edi*ing of itself in charity." (Ephesians iv, 13-16.)
7. Now, even as the Fathers of the Synod of Ephesus followed these apostolic injunctions by that wonderful union of minds, so we would fain have all, without distinction, and laying aside prejudiced opinions, take these words as addressed to themselves and happily put them into practice.
8. As all know, Nestorius was the author of the whole controversy; not that he had produced a new doctrine by his own ingenuity and study; for he had, rather, borrowed it from Theodore the Mopsuestine Bishop; and having developed it more fully, and clothed it with an appearance of novelty, with a great apparatus of words and sentences-for he was gifted with a flow of eloquence-he began to proclaim it, and used every effort to spread it abroad. Born at Germanicia, a town in Syria, he went to Antioch as a youth, in order that he be educated there in sacred and profane learning. In this city, which was very famous in that age, he first of all entered the monastic life; and then left it, from mobility of mind; and being made a priest, gave himself wholly to the office of preaching, desiring the applause of men rather than the glory of God. But the fame of his eloquence so affected the people, and spread so far and wide, that he was called to Constantinople, which was then widowed of its Pastor: and, amid great expectations on the part of all, he was raised to the episcopal dignity. Seated in this famous See, far from abandoning his novel doctrine, he persisted in teaching it and propagating it, with greater authority and more arrogance of mind.
9. In order that the case may be rightly understood it may be well to touch briefly on the chief points of the Nestorian heresy. For that arrogant man, thinking that two whole hypostases, namely, that of Jesus which was human and that of the Word which was divine, came together in one "prosopon," as he called it, denied that wondrous and substantial union of the two natures which we call hypostatic; and for this reason he asserted that the Only begotten Word of God was not made man but was in human flesh, by indwelling, by good pleasure and by the power of operation. Wherefore he was to be called "Theophoros," or God-bearer, in much the same way as prophets and other holy men can be called God-bearers by reason of the divine grace imparted to them.
10. From these perverse novelties of Nestorius it was an easy step to recognize two persons in Christ, one divine and the other human; and it followed further by necessity that the Blessed Virgin Mary was not truly the Mother of God or Theotocos; but was, rather, the Mother of the man Christ, or Christotocos, or at most Theodocos; that is to say, the receiver of God (cf. Mansi Conciliorum Amplissima Collectio IV, I.c. 1007; Schwartz, Acta Conciliorum Ecumenicorum, 1, 5, p. 408).
11. These evil dogmas, which were not taught now covertly and obscurely by a private individual, but were openly and plainly prodaimed by the Bishop of the Constantinopolitan See himself, caused a very great disturbance of the minds of men, more especially in the Eastern Church. And among the opponents of the Nestorian heresy, some of whom were found in the capital city of the Eastern Empire, the foremost place was undoubtedly taken by that most holy man, the champion of Catholic integrity, Cyril, Patriarch of Alexandria. For as he was most zealous in his care of his own sons and likewise in that of erring brethren, he had no sooner heard of the perverse opinion of the Bishop of Constantinople than he strenuously defended the orthodox faith in the presence of his own flock, and also addressed letters to Nestorius and endeavoured in the manner of a brother to lead him back to the rule of Catholic truth.
12. But when the hardened pertinacity of Nestorius had frustrated this charitable attempt, Cyril, who understood and strenuously maintained the authority of the Roman Church, would not himself take further steps, or pass sentence in such a very grave matter, until he had first applied to the Apostolic See and had ascertained its decision. Accordingly he addressed most dutiful letters to "the most blessed Father Celestine, beloved of God," wherein among other things he writes as follows: "The ancient custom of the Churches admonishes us that matters of this kind should be communicated to Your Holiness. . . " (Mansi, l.c. IV. 1011.) "But we do not openly and publicly forsake his Communion (i.e. Nestorius') before indicating these things to your piety. Vouchsafe, therefore, to prescribe what you feel in this matter so that it may be clearly known to us whether we must communicate with him or whether we should freely declare to him that no one can communicate with one who cherishes and preaches suchlike erroneous doctrine. Furthermore, the mind of Your Integrity and your judgment on this matter should be clearly set forth in letters to the Bishops of Macedonia, who are most pious and devoted to God, and likewise to the Prelates of all the East." (Mansi, l.c. IV. 1015.)
13. Nor was Nestorius ignorant of the supreme authority of the Roman Bishop over the universal Church, for more than once in letters addressed to Celestine he attempted to justify his own teaching and to prevent the mind of the most holy Pontiff and win it over to himself. But all in vain; for the ill-considered words of the heresiarch contained serious errors, and when once the Bishop of the Apostolic See clearly discerned them he forthwith applied his hand to a remedy, and lest the plague of heresy should become more perilous through delay he had them examined by a synodical judgment and solemnly condemned them, and decreed that they must be condemned by all.
14. And here, Venerable Brethren, We would have you consider carefully how much the Roman Pontiff's manner of acting in this case differed from that which had been followed by the Bishop of Alexandria. For the latter, although he occupied the See which was held to be the first in the Eastern Church, would not, as we have said, decide a very grave controversy concerning the Catholic faith for himself before he had certain knowledge of judgment of the Apostolic See. Celestine, on the contrary, having summoned a Roman Synod and weighed the matter maturely in virtue of his supreme and absolute authority over the whole of the Lord's flock, made and solemnly sanctioned these decrees concerning the Bishop of Constantinople: "Know clearly, therefore," he wrote to Nestorius, "that this is Our judgment: that unless you preach concerning Christ our God those things which are held by the Romans, the Alexandrian and the whole Catholic Church, and which the holy Church of the City of Constantinople most rightly held up till your time; and unless you shall condemn in an open and written confession this perfidious novelty which seeks to separate that which the venerable Scripture joins together; within ten days, to be numbered from the first day on which this decision becomes known to you, you are cast out from the communion of the Universal Catholic Church. We have sent this form of Our judgment to you by Our said son, the deacon Possidonius, together with all the documents addressed to Our holy brother priest, the aforesaid Bishop of the city of Alexandria, who has given us further information on this matter; we have sent these so that he may act in Our place so that Our statute may be known, whether to you or to all the brethren; for all ought to know what is being done in a matter wherein the cause of all is concerned." (Mansi, I.c. IV. 1034 sq.)
15. The Roman Pontiff ordered the Patriarch of Alexandria to execute his sentence in the following grave words: "Wherefore in virtue of the authority of Our See, and acting in Our stead, you will strictly enforce this sentence that he must either within ten days to be numbered from the day of this decision condemn his evil preachments in a written profession, and prove that he holds the same faith concerning the birth of Christ our God which is held by the Roman Church and that of your holiness and by the devotion of all; or if he will not do this, then your holiness to make provision for that Church, must know that he must by all means be removed from our body." (Migne, P.L. 50, 463; cf. Mans, I.c. IV. 1019 sq.)
16. But some writers of the past age and of more recent days, seeking to evade the luminous authority of the documents which we have cited, have given the following account of the whole matter, which they often set forth in somewhat arrogant fashion. It may be granted, they say readily, that the Roman Pontiff issued a peremptory and absolute judgment which the Bishop of Alexandria had provoked in his animosity for Nestorius, and which he very gladly made his own; none the less, the council afterwards summoned at Ephesus took the matter already judged and together condemned by the Apostolic See, and judged it afresh from the beginning and decreed by its supreme authority what must be believed about it by all. From this they say it may be gathered that an Ecumenical Council is possessed of rights altogether more powerful and more valid than the authority of the Roman Bishop.
17. But in this they have constructed a fabric of falsehood clothed with a specious appearance of truth. This may be readily seen by any one who, laying aside preconceived opinions, looks at the faithful record of fact and diligently examines the documentary evidence. For, in the first place, it must be observed that when the Emperor Theodosius, acting also in the name of his colleague Valentinian, summoned the Ecumenical Council, the judgment of Celestine had not yet arrived at Constantinople, and nothing was known about it there. Moreover, when Celestine found that a Synod at Ephesus had been ordered by the Emperors, he made no manner of objection against it; nay, more, in letters to Theodosius (Mansi, I.c. IV. 1291) and to the Bishop of Alexandria (Mansi, I.c. IV. 1292) he both praised this proposal and delegated and proclaimed his legates who were to preside at the Council, namely, the Patriarch Cyril, the Bishops Arcadius and Projectus, and the Priest Philip. But by acting thus the Pontiff did not leave an unjudged case to the decision of the Council; but, as he said himself, the things which he had already decreed (Mansi, I.c. IV. 1287) were still to remain, and he ordered the Fathers of the Council to execute the sentence passed by himself, yet so that, by taking counsel together, and offering prayers to God, they were to strive, as far as possible, to bring back the erring Bishop of Constantinople to the unity of the faith. Thus, when Cyril asked the Pontiff how he was to act in this matter, that is to say, "whether the holy Synod ought to receive the man on his condemning the things which he had preached, or whether, because the appointed time had now run out, the sentence long since passed must abide," Celestine answered as follows: "It is for your holiness, together with the venerable council of brethren, to see that the disturbances that have arisen in the Church may be repressed, and when by the help of God the matter is finished, We may learn this from the correction which has been decided. We do not say that We are absent from your assembly; for We cannot be absent from those with whom, wheresoever they may be, We are joined together by one faith. . . We are there because We are thinking that which is being done there for all; We do that spiritually which We seem not to do in a bodily manner. We yearn for Catholic peace; We yearn for the salvation of him who is perishing, yet so if he will but confess his sickness. We say this that We may not seem to be wanting to one who is willing to correct himself. May he prove that We do not have feet swift to shed blood, when he knows that a remedy is offered also to him." (Mansi, l.c. IV. 1292.)
18. But if these words of Celestine show us his fatherly heart, and make it abundantly clear that he desired nothing more earnestly than that the light of the true faith should illuminate the eyes that were blinded, and that he would rejoice when those who were in error came back to the Church, at the same time, the instructions which he gave to his Legates, when they were setting out for Ephesus, prove how great was the Pontiff's care and solicitude in bidding them preserve the divinely given rights of the Roman See safe and intact. Thus, among other things, he says: "We command you that the authority of the Apostolic See ought to be safeguarded; for the instructions delivered to you tell you this, that you are to be present in the assembly, and if they come to a discussion you are to judge of their opinions but are not to engage in the contest." (Mansi, 1.c. IV. 556.)
19. And the Legates acted in this way with the assent of the Fathers of the sacred Synod. For, following firmly and faithfully the aforesaid absolute commands of the Pontiff when they arrived at Ephesus after the first act was completed, they demanded that all the things decreed in the previous assembly should be submitted to them so that they might be confirmed and ratified in the name of the Apostolic See: "We pray you to order that all things that have been done in this holy Synod before our arrival may be shown to us, so that we also may confirm them according to the judgment of our blessed Pope and of this present holy Synod. . . " (Mansi, 1.c. IV. 1290.)
20. Philip the Priest also, in the presence of the whole Council, gave utterance to that excellent pronouncement on the Primacy of the Roman Church which is cited in the dogmatic Constitution Pastor Aetemus of the Vatican Council (Conc. Vatic. sess. IV. cap. 2): Namely: "No one doubts, as it was known in all ages, that the holy and most blessed Peter, the prince and head of the Apostles, the pillar of the faith, and the foundation of the Catholic Church, received from our Lord Jesus Christ, the Savior and Redeemer of mankind, the keys of the kingdom; and the power of binding and loosing sins was given to him; and unto this time, and ever, he lives and exercises judgment in his successors." (Mansi, I.c. IV. 1295.)
21. What more need be said? Did the Fathers of the Ecumenical Council make any objection to this manner of acting adopted by Celestine and his Legates, or oppose it in any way? By no manner of means. On the contrary, written monuments remain which plainly show their own dutiful observance and reverence. For when, in the second session of the sacred synod, the Papal Legates, reading the letters of Celestine, said among other things: "In Our solicitude, We have sent to you our holy brothers and fellowpriests of one mind with Ourselves, those trustworthy men Arcadius and Projectus the Bishops, and Philip our Priest, that they may be present at what is being done, and may execute the things which have already been decreed by Us; whereunto we doubt not that your holiness will give your consent" (Mansi, 1.c., IV. 1287); the Fathers of the Council were so far from refusing this sentence as it were of a supreme judge that, praising it with one voice, they saluted the Roman Pontiff with these abundant acclamations: "This is a just judgment! The whole synod gives thanks to Celestine the new Paul, to Cyril the new Paul, to Celestine the guardian of the faith, to Celestine one at heart with the Synod, to Celestine the whole Synod gives thanks; there is one Celestine, one Cyril, one faith of the Synod, one faith of the whole world." (Mansi, 1.c., IV. 1287.)
22. But when they came to the condemnation and rejection of Nestorius, the same Fathers of the Council did not think that they were free to judge the whole cause afresh; but openly profess that they are prevented and compelled by the sentence of the Roman Pontiff: "Understanding that he (Nestorius) thinks and preaches impiously, and compelled by the sacred canons and by the letter of our most holy Father and fellowminister Celestine the Bishop of the Roman Church, we come of necessity, and with tears, to this lamentable sentence against him. Wherefore our Lord Jesus Christ, who was assailed by this
man's words of blasphemy, has declared, through this most holy Synod, that the said Nestorius is deprived of the Episcopal dignity, and is a stranger to the whole fellowship and company of Priests." (Mansi, 1.c. IV. 1294 sq.)
23. And in the second session of the Council, Firmus Bishop of Caesarea, in like manner, openly professed the same thing in these words: "The Apostolic and Holy See, through the letters of the most Holy Bishop Celestine, which he sent to the most religious Bishops, prescribed beforehand the judgment and rule concerning the present matter, which we also have followed; and because Nestorius, having been cited by us has not appeared, we have put that form in execution, declaring the canonical and apostolic judgment against him." (Mansi, 1.c., IV. 1287 sq.)
24. Now all the various documents which have been rehearsed by Us, one after another, prove so expressly and significantly that already, throughout the universal Church, there was a strong and common faith in the authority of the Roman Pontiff over the whole flock of Christ, an authority subject to no one and incapable of error, so that these things bring back to Our mind the clear and luminous words of Augustine, uttered a few years before this, concerning the judgment passed by Pope Zosimus against the Pelagians in his Epistula Tractatoria: "In these words of the Apostolic See, the Catholic faith is so venerable, so firmly founded, so certain and so clear, that it were impious for a Christian to doubt of it." (Epist. 190; Corpus Scriptorum ecclesiasticorum latinorum, 57, p. 159 sq.)
25. Would that that most holy Bishop of Hippo could have been present at the Synod of Ephesus; how much his marvellously acute intellect, perceiving the dividing line in the discussions, would have illustrated the dogmas of Catholic truth, and how he would have defended them with all his strength of mind! But when the imperial legates, bearing the letters of invitation, arrived at Hippo, there was nothing left them to do but to lament that that great luminary of Christian wisdom was extinguished and that his See was laid waste by the Vandals.
26. We are well aware, Venerable Brethren, that some of those who, especially in the present age, devote themselves to historical research, use every effort to clear Nestorius from the stain of heresy; and that they also accuse the most holy Cyril, Bishop of Alexandria, of unjust animosity, saying that, because Nestorius was obnoxious to him, he calumniated him and strove with all his strength to procure his condemnation for things which he had never taught. Our most blessed predecessor Celestine, whose simplicity is said to have been abused by Cyril, and the holy Synod of Ephesus also, are involved in this most grave accusation by these defenders of the Bishop of Constantinople.
27. The Church, however, protests against this futile and temerarious attempt; for she has at all times acknowledged the condemnation of Nestorius as rightly and deservedly decreed; and has regarded the doctrine of Cyril as orthodox; and has counted the Council of Ephesus among the Ecumenical Synods, celebrated under the guidance of the Holy Spirit, and has held it in veneration. For, to omit very many luminous monuments of documentary evidence, all know, assuredly, that many associates of Nestorius, who had seen with their own eyes the whole course of events, and who had no friendly intimacy with Cyril: despite the fact that they were drawn to the opposite side, by their friendship with Nestorius, by the great charm of his writings, and by the very heat engendered in the disputations; nevertheless, after the Synod of Ephesus, moved as it were by the light of truth, gradually deserted the heretical Bishop of Constantinople, who by the just law of the Church was to be avoided. Some of these were certainly still living when Our predecessor of happy memory, Leo the Great, wrote in these terms to Paschasinus, Bishop of Lilybeta, and his own legate to the Council of Chalcedon: "Know that the whole Church of Constantinople, with all its monasteries and many Bishops, has given its consent, and has subscribed to the anathematization of Nestorius and Eutyches and their dogmas" (Mansi, 1.c. VI. 124); but in his dogmatic letter to the Emperor Leo, he quite openly rebukes Nestorius as a heretic and a teacher of heresy, without any one gainsaying it; for he says: "Let Nestorius, therefore, be anathematized, who believed the Blessed Virgin Mary to be the mother, not of God, but of man only, so that he made one person of the flesh, and another of the Godhead, and did not perceive that there was but one Christ, in the Word of God and in the flesh; but preached separately and severally one the Son of God, and the other of man." (Mansi, 1.c. VI. 351-354.) The same thing, as every one knows,
was solemnly sanctioned by the Council of Chalcedon, when it condemned Nestorius again, and praised the teaching of Cyril. And Our most holy predecessor Gregory the Great, when he had just been raised to the Chair of Blessed Peter, in his synodical letter to the Eastern Churches, having mentioned these four Ecumenical Councils, namely, those of Nicaea, Constantinople, Ephesus, and Chalcedon, speaks of them in these words of great moment and nobility: " . . . On these, as on a four square stone, the structure of the holy faith arises; and of whatever life or office he may be, whosoever does not hold their solidity, even though he is seen to be a stone, yet he lieth outside the edifice." (Migne, P.L. 77, 478; cf. Mansi, l.c. IX. 1048.) Wherefore all should hold it as certain that Nestorius really preached heretical novelties; that the Patriarch of Alexandria was a strenuous defender of the Catholic faith; and that the Pontiff Celestine, together with the Synod of Ephesus, maintained both the ancient doctrine of the fathers and the supreme authority of the Apostolic See.
