Apostolic Succession

The Catholic Church has always taught that there is a historical continuity - rooted in apostolic succession - between the Church founded by Christ and the Catholic Church.  The apostolic succession of the ministry concerns the whole Church, but it is not something that derives from the Church taken as a whole, but rather from Christ to the apostles and from the apostles to all the bishops to the end of time. 

Catechism Of The Catholic Church

857 The Church is apostolic because she is founded on the apostles, in three ways:

- she was and remains built on "the foundation of the Apostles," The witnesses chosen and sent on mission by Christ himself;

- with the help of the Spirit dwelling in her, the Church keeps and hands on the teaching, the "good deposit," the salutary words she has heard from the apostles;

- she continues to be taught, sanctified, and guided by the apostles until Christ's return, through their successors in pastoral office: the college of bishops, "assisted by priests, in union with the successor of Peter, the Church's supreme pastor":

You are the eternal Shepherd who never leaves his flock untended. Through the apostles you watch over us and protect us always. You made them shepherds of the flock to share in the work of your Son....

858 Jesus is the Father's Emissary. From the beginning of his ministry, he "called to him those whom he desired; .... and he appointed twelve, whom also he named apostles, to be with him, and to be sent out to preach." From then on, they would also be his "emissaries" (Greek apostoloi). In them, Christ continues his own mission: "As the Father has sent me, even so I send you." The apostles' ministry is the continuation of his mission; Jesus said to the Twelve: "he who receives you receives me."

859 Jesus unites them to the mission he received from the Father. As "the Son can do nothing of his own accord," but receives everything from the Father who sent him, so those whom Jesus sends can do nothing apart from him, from whom they received both the mandate for their mission and the power to carry it out. Christ's apostles knew that they were called by God as "ministers of a new covenant," "servants of God," "ambassadors for Christ," "servants of Christ and stewards of the mysteries of God."

860 In the office of the apostles there is one aspect that cannot be transmitted: to be the chosen witnesses of the Lord's Resurrection and so the foundation stones of the Church. But their office also has a permanent aspect. Christ promised to remain with them always. the divine mission entrusted by Jesus to them "will continue to the end of time, since the Gospel they handed on is the lasting source of all life for the Church. Therefore, . . . the apostles took care to appoint successors." The bishops - successors of the apostles

861 "In order that the mission entrusted to them might be continued after their death, [the apostles] consigned, by will and testament, as it were, to their immediate collaborators the duty of completing and consolidating the work they had begun, urging them to tend to the whole flock, in which the Holy Spirit had appointed them to shepherd the Church of God. They accordingly designated such men and then made the ruling that likewise on their death other proven men should take over their ministry."

862 "Just as the office which the Lord confided to Peter alone, as first of the apostles, destined to be transmitted to his successors, is a permanent one, so also endures the office, which the apostles received, of shepherding the Church, a charge destined to be exercised without interruption by the sacred order of bishops." Hence the Church teaches that "the bishops have by divine institution taken the place of the apostles as pastors of the Church, in such wise that whoever listens to them is listening to Christ and whoever despises them despises Christ and him who sent Christ."

What Did Jesus Teach?

“Whoever receives you receives me, and whoever receives me receives the one who sent me. (Matthew 10:40)

“If your brother sins [against you], go and tell him his fault between you and him alone. If he listens to you, you have won over your brother. If he does not listen, take one or two others along with you, so that ‘every fact may be established on the testimony of two or three witnesses.’ If he refuses to listen to them, tell the church. If he refuses to listen even to the church, then treat him as you would a Gentile or a tax collector.  (Matthew 18:15-17)

Then Jesus approached and said to them, “All power in heaven and on earth has been given to me. Go, therefore, and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the holy Spirit, teaching them to observe all that I have commanded you. And behold, I am with you always, until the end of the age.” (Matthew 28:18-20)

Whoever listens to you listens to me. Whoever rejects you rejects me. And whoever rejects me rejects the one who sent me.” (Luke 10:16)

And he said to them, “Thus it is written that the Messiah would suffer and rise from the dead on the third day and that repentance, for the forgiveness of sins, would be preached in his name to all the nations, beginning from Jerusalem." (Luke 24:46-47)

[Jesus] said to them again, “Peace be with you. As the Father has sent me, so I send you.” (John 20:21)

What Does The Rest Of The Bible Teach?

During those days Peter stood up in the midst of the brothers (there was a group of about one hundred and twenty persons in the one place). He said, “My brothers, the scripture had to be fulfilled which the holy Spirit spoke beforehand through the mouth of David, concerning Judas, who was the guide for those who arrested Jesus. He was numbered among us and was allotted a share in this ministry. He bought a parcel of land with the wages of his iniquity, and falling headlong, he burst open in the middle, and all his insides spilled out. This became known to everyone who lived in Jerusalem, so that the parcel of land was called in their language ‘Akeldama,’ that is, Field of Blood. For it is written in the Book of Psalms: ‘Let his encampment become desolate, and may no one dwell in it.’ And: ‘May another take his office.’ Therefore, it is necessary that one of the men who accompanied us the whole time the Lord Jesus came and went among us, beginning from the baptism of John until the day on which he was taken up from us, become with us a witness to his resurrection.” So they proposed two, Joseph called Barsabbas, who was also known as Justus, and Matthias. Then they prayed, “You, Lord, who know the hearts of all, show which one of these two you have chosen to take the place in this apostolic ministry from which Judas turned away to go to his own place.” Then they gave lots to them, and the lot fell upon Matthias, and he was counted with the eleven apostles. (Acts 1:15-26)

“The apostles and the presbyters, your brothers, to the brothers in Antioch, Syria, and Cilicia of Gentile origin: greetings. Since we have heard that some of our number [who went out] without any mandate from us have upset you with their teachings and disturbed your peace of mind, we have with one accord decided to choose representatives and to send them to you along with our beloved Barnabas and Paul, who have dedicated their lives to the name of our Lord Jesus Christ. So we are sending Judas and Silas who will also convey this same message by word of mouth: ‘It is the decision of the holy Spirit and of us not to place on you any burden beyond these necessities . . . .'" (Acts 15:23-28)

As they traveled from city to city, they handed on to the people for observance the decisions reached by the apostles and presbyters in Jerusalem. Day after day the churches grew stronger in faith and increased in number. (Acts 16:4-5)

So then you are no longer strangers and sojourners, but you are fellow citizens with the holy ones and members of the household of God, built upon the foundation of the apostles and prophets, with Christ Jesus himself as the capstone.Through him the whole structure is held together and grows into a temple sacred in the Lord . . . . (Ephesians 2:19-21)

But if I should be delayed, you should know how to behave in the household of God, which is the church of the living God, the pillar and foundation of truth. (1 Timothy 3:15)

Do not neglect the gift you have, which was conferred on you through the prophetic word with the imposition of hands of the presbyterate. (1 Timothy 4:14)

So you, my child, be strong in the grace that is in Christ Jesus.  And what you heard from me through many witnesses entrust to faithful people who will have the ability to teach others as well. (2 Timothy 2:1-2)

For this reason I left you in Crete so that you might set right what remains to be done and appoint presbyters in every town, as I directed you . . . . (Titus 1:5)

No one takes this honor upon himself but only when called by God, just as Aaron was. (Hebrews 5:4)

What Did The Church Fathers Teach?

“Through countryside and city [the apostles] preached, and they appointed their earliest converts, testing them by the Spirit, to be the bishops and deacons of future believers. Nor was this a novelty, for bishops and deacons had been written about a long time earlier. . . . Our apostles knew through our Lord Jesus Christ that there would be strife for the office of bishop. For this reason, therefore, having received perfect foreknowledge, they appointed those who have already been mentioned and afterwards added the further provision that, if they should die, other approved men should succeed to their ministry” (Pope Clement I, Letter to the Corinthians 42:4–5, 44:1–3 [A.D. 80]).

“When I had come to Rome, I [visited] Anicetus, whose deacon was Eleutherus. And after Anicetus [died], Soter succeeded, and after him Eleutherus. In each succession and in each city there is a continuance of that which is proclaimed by the law, the prophets, and the Lord” (Hiegesippus, Memoirs, cited in Eusebius, Ecclesiastical History 4:22 [A.D. 180]).

“It is possible, then, for everyone in every church, who may wish to know the truth, to contemplate the tradition of the apostles which has been made known to us throughout the whole world. And we are in a position to enumerate those who were instituted bishops by the apostles and their successors down to our own times, men who neither knew nor taught anything like what these heretics rave about” (Irenaeus, Against Heresies 3:3:1 [A.D. 189]).

“The blessed apostles [Peter and Paul], having founded and built up the church [of Rome] . . . handed over the office of the episcopate to Linus” (Irenaeus, Against Heresies 3:3:3 [A.D. 189]).

“But since it would be too long to enumerate in such a volume as this the successions of all the churches, we shall confound all those who, in whatever manner, whether through self-satisfaction or vainglory, or through blindness and wicked opinion, assemble other than where it is proper, by pointing out here the successions of the bishops of the greatest and most ancient church known to all, founded and organized at Rome by the two most glorious apostles, Peter and Paul—that church which has the tradition and the faith with which comes down to us after having been announced to men by the apostles. For with this Church, because of its superior origin, all churches must agree, that is, all the faithful in the whole world. And it is in her that the faithful everywhere have maintained the apostolic tradition” (ibid., 3:3:2).

“Polycarp also was not only instructed by apostles, and conversed with many who had seen Christ, but was also, by apostles in Asia, appointed bishop of the church in Smyrna, whom I also saw in my early youth, for he tarried [on earth] a very long time, and, when a very old man, gloriously and most nobly suffering martyrdom, departed this life, having always taught the things which he had learned from the apostles, and which the Church has handed down, and which alone are true. To these things all the Asiatic churches testify, as do also those men who have succeeded Polycarp down to the present time” (ibid., 3:3:4).

“Since therefore we have such proofs, it is not necessary to seek the truth among others which it is easy to obtain from the Church; since the apostles, like a rich man [depositing his money] in a bank, lodged in her hands most copiously all things pertaining to the truth, so that every man, whosoever will, can draw from her the water of life. . . . For how stands the case? Suppose there arise a dispute relative to some important question among us, should we not have recourse to the most ancient churches with which the apostles held constant conversation, and learn from them what is certain and clear in regard to the present question?” (ibid., 3:4:1).

“[I]t is incumbent to obey the presbyters who are in the Church—those who, as I have shown, possess the succession from the apostles; those who, together with the succession of the episcopate, have received the infallible charism of truth, according to the good pleasure of the Father. But [it is also incumbent] to hold in suspicion others who depart from the primitive succession, and assemble themselves together in any place whatsoever, either as heretics of perverse minds, or as schismatics puffed up and self-pleasing, or again as hypocrites, acting thus for the sake of lucre and vainglory. For all these have fallen from the truth” (ibid., 4:26:2).

“The true knowledge is the doctrine of the apostles, and the ancient organization of the Church throughout the whole world, and the manifestation of the body of Christ according to the succession of bishops, by which succession the bishops have handed down the Church which is found everywhere” (ibid., 4:33:8).

“[The apostles] founded churches in every city, from which all the other churches, one after another, derived the tradition of the faith, and the seeds of doctrine, and are every day deriving them, that they may become churches. Indeed, it is on this account only that they will be able to deem themselves apostolic, as being the offspring of apostolic churches. Every sort of thing must necessarily revert to its original for its classification. Therefore the churches, although they are so many and so great, comprise but the one primitive Church, [founded] by the apostles, from which they all [spring]. In this way, all are primitive, and all are apostolic, while they are all proved to be one in unity” (Tertullian, Demurrer Against the Heretics 20 [A.D. 200]).

“[W]hat it was which Christ revealed to them [the apostles] can, as I must here likewise prescribe, properly be proved in no other way than by those very churches which the apostles founded in person, by declaring the gospel to them directly themselves . . . If then these things are so, it is in the same degree manifest that all doctrine which agrees with the apostolic churches—those molds and original sources of the faith must be reckoned for truth, as undoubtedly containing that which the churches received from the apostles, the apostles from Christ, [and] Christ from God. Whereas all doctrine must be prejudged as false which savors of contrariety to the truth of the churches and apostles of Christ and God. It remains, then, that we demonstrate whether this doctrine of ours, of which we have now given the rule, has its origin in the tradition of the apostles, and whether all other doctrines do not ipso facto proceed from falsehood” (ibid., 21).

“But if there be any [heresies] which are bold enough to plant [their origin] in the midst of the apostolic age, that they may thereby seem to have been handed down by the apostles, because they existed in the time of the apostles, we can say: Let them produce the original records of their churches; let them unfold the roll of their bishops, running down in due succession from the beginning in such a manner that [their first] bishop shall be able to show for his ordainer and predecessor some one of the apostles or of apostolic men—a man, moreover, who continued steadfast with the apostles. For this is the manner in which the apostolic churches transmit their registers: as the church of Smyrna, which records that Polycarp was placed therein by John; as also the church of Rome, which makes Clement to have been ordained in like manner by Peter” (ibid., 32).

“But should they even effect the contrivance [of composing a succession list for themselves], they will not advance a step. For their very doctrine, after comparison with that of the apostles [as contained in other churches], will declare, by its own diversity and contrariety, that it had for its author neither an apostle nor an apostolic man; because, as the apostles would never have taught things which were self-contradictory” (ibid.).

“Then let all the heresies, when challenged to these two tests by our apostolic Church, offer their proof of how they deem themselves to be apostolic. But in truth they neither are so, nor are they able to prove themselves to be what they are not. Nor are they admitted to peaceful relations and communion by such churches as are in any way connected with apostles, inasmuch as they are in no sense themselves apostolic because of their diversity as to the mysteries of the faith” (ibid.).

“[T]his is the way in which the apostolic churches transmit their lists: like the church of the Smyrneans, which records that Polycarp was placed there by John, like the church of the Romans, where Clement was ordained by Peter” (Tertullian, Demurrer Against the Heretics 32:2 [A.D. 200]).

“Victor . . . was the thirteenth bishop of Rome from Peter” (The Little Labyrinth [A.D. 211], in Eusebius, Church History 5:28:3).

“The Lord says to Peter: ‘I say to you,’ he says, ‘that you are Peter, and upon this rock I will build my Church, and the gates of hell will not overcome it. … ’ [Matt. 16:18]. On him [Peter] he builds the Church, and to him he gives the command to feed the sheep [John 21:17], and although he assigns a like power to all the apostles, yet he founded a single chair [cathedra], and he established by his own authority a source and an intrinsic reason for that unity. . . . If someone [today] does not hold fast to this unity of Peter, can he imagine that he still holds the faith? If he [should] desert the chair of Peter upon whom the Church was built, can he still be confident that he is in the Church?” (Cyprian of Carthage, The Unity of the Catholic Church 4; first edition [A.D. 251]).

“Cornelius was made bishop by the decision of God and of his Christ, by the testimony of almost all the clergy, by the applause of the people then present, by the college of venerable priests and good men, at a time when no one had been made [bishop] before him—when the place of [Pope] Fabian, which is the place of Peter, the dignity of the sacerdotal chair, was vacant. Since it has been occupied both at the will of God and with the ratified consent of all of us, whoever now wishes to become bishop must do so outside. For he cannot have ecclesiastical rank who does not hold to the unity of the Church” (Cyprian of Carthage, Letters 55:[52]):8 [A.D. 253]).

“With a false bishop appointed for themselves by heretics, they dare even to set sail and carry letters from schismatics and b.asphemers to the chair of Peter and to the principal church [at Rome], in which sacerdotal unity has its source” (ibid., 59:14).

“[T]he Church is one, and as she is one, cannot be both within and without. For if she is with [the heretic] Novatian, she was not with [Pope] Cornelius. But if she was with Cornelius, who succeeded the bishop [of Rome], Fabian, by lawful ordination, and whom, beside the honor of the priesthood the Lord glorified also with martyrdom, Novatian is not in the Church; nor can he be reckoned as a bishop, who, succeeding to no one, and despising the evangelical and apostolic tradition, sprang from himself. For he who has not been ordained in the Church can neither have nor hold to the Church in any way” (Cyprian of Carthage, Letters 69[75]:3 [A.D. 253]).

“Paul testifies that Crescens was sent to Gaul [2 Tim. 4:10], but Linus, whom he mentions in the Second Epistle to Timothy [2 Tim. 4:21] as his companion at Rome, was Peter’s successor in the episcopate of the church there, as has already been shown. Clement also, who was appointed third bishop of the church at Rome, was, as Paul testifies, his co-laborer and fellow-soldier [Phil. 4:3]” (Eusebius of Caesarea, Church History 3:4:9–10 [A.D. 312]).

“[The] judgment [against Athanasius] ought to have been made, not as it was, but according to the ecclesiastical canon. . . . Are you ignorant that the custom has been to write first to us and then for a just decision to be passed from this place [Rome]? If, then, any such suspicion rested upon the bishop there [Athanasius of Alexandria], notice of it ought to have been written to the church here. But now, after having done as they pleased, they want to obtain our concurrence, although we never condemned him. Not thus are the constitutions of Paul, not thus the traditions of the Fathers. This is another form of procedure, and a novel practice. . . . What I write about this is for the common good. For what we have heard from the blessed apostle Peter, these things I signify to you” (Pope Julius I, Letter on Behalf of Athanasius [A.D. 341], contained in Athanasius, Apology Against the Arians 20–35).

“[I]f any bishop loses the judgment in some case [decided by his fellow bishops] and still believes that he has not a bad but a good case, in order that the case may be judged anew . . . let us honor the memory of the apostle Peter by having those who have given the judgment write to Julius, bishop of Rome, so that if it seem proper he may himself send arbiters and the judgment may be made again by the bishops of a neighboring province” (Council of Sardica, Canon 3 [A.D. 342]).

“You cannot deny that you are aware that in the city of Rome the episcopal chair was given first to Peter; the chair in which Peter sat, the same who was head—that is why he is also called Cephas [‘Rock’]—of all the apostles; the one chair in which unity is maintained by all” (Optatus, The Schism of the Donatists 2:2 [A.D. 367]).

“At Rome the first apostles and bishops were Peter and Paul, then Linus, then Cletus, then Clement, the contemporary of Peter and Paul” (Epiphanius of Salamis, Medicine Chest Against All Heresies 27:6 [A.D. 375]).

“Likewise it is decreed: . . . [W]e have considered that it ought to be announced that . . . the holy Roman Church has been placed at the forefront not by the conciliar decisions of other churches, but has received the primacy by the evangelic voice of our Lord and Savior, who says: ‘You are Peter, and upon this rock I will build my Church, and the gates of hell will not prevail against it; and I will give to you the keys of the kingdom of heaven, and whatever you shall have bound on earth will be bound in heaven, and whatever you shall have loosed on earth shall be loosed in heaven’ [Matt. 16:18–19]. The first see [today], therefore, is that of Peter the apostle, that of the Roman Church, which has neither stain nor blemish nor anything like it” (Pope Damasus I, Decree of Damasus 3 [A.D. 382]).

“[Pope] Stephen . . . was the blessed Peter’s twenty-second successor in the See of Rome” (Jerome, Against the Luciferians 23 [A.D. 383]).

“[T]hey [the Novatian heretics] have not the succession of Peter, who hold not the chair of Peter, which they rend by wicked schism; and this, too, they do, wickedly denying that sins can be forgiven [by the sacrament of confession] even in the Church, whereas it was said to Peter: ‘I will give unto thee the keys of the kingdom of heaven, and whatsoever thou shalt bind on earth shall be bound also in heaven, and whatsoever thou shall loose on earth shall be loosed also in heaven’[Matt. 16:19]” (Ambrose of Milan, Penance 1:7:33 [A.D. 388]).

“Clement, of whom the apostle Paul writing to the Philippians says ‘With Clement and others of my fellow-workers whose names are written in the book of life,’ the fourth bishop of Rome after Peter, if indeed the second was Linus and the third Anacletus, although most of the Latins think that Clement was second after the apostle” (Jerome, Lives of Illustrious Men 15 [A.D. 396]).

“Since the East, shattered as it is by the long-standing feuds, subsisting between its peoples, is bit by bit tearing into shreds the seamless vest of the Lord . . . I think it my duty to consult the chair of Peter, and to turn to a church [Rome] whose faith has been praised by Paul [Rom. 1:8]. I appeal for spiritual food to the church whence I have received the garb of Christ. . . . Evil children have squandered their patrimony; you alone keep your heritage intact” (Jerome, Letters 15:1 [A.D. 396]).

… “I follow no leader but Christ and join in communion with none but your blessedness [Pope Damasus I], that is, with the chair of Peter. I know that this is the rock on which the Church has been built. Whoever eats the Lamb outside this house is profane. Anyone who is not in the ark of Noah will perish when the flood prevails” (ibid., 15:2).

“The church here is split into three parts, each eager to seize me for its own. . . . Meanwhile I keep crying, ‘He that is joined to the chair of Peter is accepted by me!’ . . . Therefore, I implore your blessedness [Pope Damasus I] . . . tell me by letter with whom it is that I should communicate in Syria” (ibid., 16:2).

“Far be it from me to speak adversely of any of these clergy who, in succession from the apostles, confect by their sacred word the Body of Christ and through whose efforts also it is that we are Christians” (Jerome, Letters 14:8 [A.D. 396]).

“[T]here are many other things which most properly can keep me in [the Catholic Church’s] bosom. The unanimity of peoples and nations keeps me here. Her authority, inaugurated in miracles, nourished by hope, augmented by love, and confirmed by her age, keeps me here. The succession of priests, from the very see of the apostle Peter, to whom the Lord, after his resurrection, gave the charge of feeding his sheep [John 21:15–17], up to the present episcopate, keeps me here. And last, the very name Catholic, which, not without reason, belongs to this Church alone, in the face of so many heretics, so much so that, although all heretics want to be called ‘Catholic,’ when a stranger inquires where the Catholic Church meets, none of the heretics would dare to point out his own basilica or house” (Augustine, Against the Letter of Mani Called “The Foundation” 4:5 [A.D. 397]).  

“If all men throughout the world were such as you most vainly accuse them of having been, what has the chair of the Roman church done to you, in which Peter sat, and in which Anastasius sits today?” (Augustine, Against the Letters of Petilani 2:118 [A.D. 402]).

“If the very order of episcopal succession is to be considered, how much more surely, truly, and safely do we number them from Peter himself, to whom, as to one representing the whole Church, the Lord said, ‘Upon this rock I will build my Church’ . . . [Matt. 16:18]. Peter was succeeded by Linus, Linus by Clement, Clement by Anacletus, Anacletus by Evaristus . . . ” (Augustine, Letters 53:1:2 [A.D. 412]).

“Philip the presbyter and legate of the Apostolic See said: ‘There is no doubt, and in fact it has been known in all ages, that the holy and most blessed Peter, prince and head of the apostles, pillar of the faith, and 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 him was given the power of loosing and binding sins: who down even to today and forever both lives and judges in his successors. The holy and most blessed pope Celestine, according to due order, is his successor and holds his place, and us he sent to supply his place in this holy synod’” (Council of Ephesus, Acts of the Council, session 3 [A.D. 431]).

“As for the resolution of the bishops which is contrary to the Nicene decree, in union with your faithful piety, I declare it to be invalid and annul it by the authority of the holy apostle Peter” (Pope Leo I, Letters 110 [A.D. 445]).

“Whereupon the blessed Peter, as inspired by God, and about to benefit all nations by his confession, said, ‘You are the Christ, the Son of the living God.’ Not undeservedly, therefore, was he pronounced blessed by the Lord, and derived from the original Rock that solidity which belonged both to his virtue and to his name [Peter]” (Pope Leo I, The Tome of Leo [A.D. 449]).

“We exhort you in every respect, honorable brother, to heed obediently what has been written by the most blessed pope of the city of Rome, for blessed Peter, who lives and presides in his own see, provides the truth of faith to those who seek it. For we, by reason of our pursuit of peace and faith, cannot try cases on the faith without the consent of the bishop of Rome” (Peter Chrysologus, Letters 25:2 [A.D. 449]).

“After the reading of the foregoing epistle [The Tome of Leo], the most reverend bishops cried out: ‘This is the faith of the fathers! This is the faith of the apostles! So we all believe! Thus the orthodox believe! Anathema to him who does not thus believe! Peter has spoken thus through Leo! . . . This is the true faith! Those of us who are orthodox thus believe! This is the faith of the Fathers!’” (Council of Chalcedon, Acts of the Council, session 2 [A.D. 451]).

What Have The Popes And The Magisterium Taught?

Thus apostolic succession is that aspect of the nature and life of the Church that shows the dependence of our present-day community on Christ through those whom he has sent. The apostolic ministry is, therefore, the sacrament of the effective presence of Christ and of his Spirit in the midst of the people of God, and this view in no way underestimates the immediate influence of Christ and his Spirit on each believer.
* * *
The apostolic succession of the ministry concerns the whole Church, but it is not something that derives from the Church taken as a whole but rather from Christ to the apostles and from the apostles to all bishops to the end of time. International Theological Commission, Catholic Teaching on Apostolic Succession (1973).

IV. UNICITY AND UNITY OF THE CHURCH

16. The Lord Jesus, the only Saviour, did not only establish a simple community of disciples, but constituted the Church as a salvific mystery: he himself is in the Church and the Church is in him (cf. Jn 15:1ff.; Gal 3:28; Eph 4:15-16; Acts 9:5). Therefore, the fullness of Christ's salvific mystery belongs also to the Church, inseparably united to her Lord. Indeed, Jesus Christ continues his presence and his work of salvation in the Church and by means of the Church (cf. Col 1:24-27), which is his body (cf. 1 Cor 12:12-13, 27; Col 1:18). And thus, just as the head and members of a living body, though not identical, are inseparable, so too Christ and the Church can neither be confused nor separated, and constitute a single “whole Christ”‌. This same inseparability is also expressed in the New Testament by the analogy of the Church as the Bride of Christ (cf. 2 Cor 11:2; Eph 5:25-29; Rev 21:2,9).

Therefore, in connection with the unicity and universality of the salvific mediation of Jesus Christ, the unicity of the Church founded by him must be firmly believed as a truth of Catholic faith. Just as there is one Christ, so there exists a single body of Christ, a single Bride of Christ: “a single Catholic and apostolic Church”‌. Furthermore, the promises of the Lord that he would not abandon his Church (cf. Mt 16:18; 28:20) and that he would guide her by his Spirit (cf. Jn 16:13) mean, according to Catholic faith, that the unicity and the unity of the Church - like everything that belongs to the Church's integrity - will never be lacking.

The Catholic faithful are required to profess that there is an historical continuity - rooted in the apostolic succession - between the Church founded by Christ and the Catholic Church: “This is the single Church of Christ... which our Saviour, after his resurrection, entrusted to Peter's pastoral care (cf. Jn 21:17), commissioning him and the other Apostles to extend and rule her (cf. Mt 28:18ff.), erected for all ages as 'the pillar and mainstay of the truth' (1 Tim 3:15). This Church, constituted and organized as a society in the present world, subsists in [subsistit in] the Catholic Church, governed by the Successor of Peter and by the Bishops in communion with him”‌. With the expression subsistit in, the Second Vatican Council sought to harmonize two doctrinal statements: on the one hand, that the Church of Christ, despite the divisions which exist among Christians, continues to exist fully only in the Catholic Church, and on the other hand, that “outside of her structure, many elements can be found of sanctification and truth”‌, that is, in those Churches and ecclesial communities which are not yet in full communion with the Catholic Church. But with respect to these, it needs to be stated that “they derive their efficacy from the very fullness of grace and truth entrusted to the Catholic Church”‌.

17. Therefore, there exists a single Church of Christ, which subsists in the Catholic Church, governed by the Successor of Peter and by the Bishops in communion with him. The Churches which, while not existing in perfect communion with the Catholic Church, remain united to her by means of the closest bonds, that is, by apostolic succession and a valid Eucharist, are true particular Churches. Therefore, the Church of Christ is present and operative also in these Churches, even though they lack full communion with the Catholic Church, since they do not accept the Catholic doctrine of the Primacy, which, according to the will of God, the Bishop of Rome objectively has and exercises over the entire Church.

On the other hand, the ecclesial communities which have not preserved the valid Episcopate and the genuine and integral substance of the Eucharistic mystery, are not Churches in the proper sense; however, those who are baptized in these communities are, by Baptism, incorporated in Christ and thus are in a certain communion, albeit imperfect, with the Church. Baptism in fact tends per se toward the full development of life in Christ, through the integral profession of faith, the Eucharist, and full communion in the Church.

“The Christian faithful are therefore not permitted to imagine that the Church of Christ is nothing more than a collection - divided, yet in some way one - of Churches and ecclesial communities; nor are they free to hold that today the Church of Christ nowhere really exists, and must be considered only as a goal which all Churches and ecclesial communities must strive to reach”‌. In fact, “the elements of this already-given Church exist, joined together in their fullness in the Catholic Church and, without this fullness, in the other communities”‌. “Therefore, these separated Churches and communities as such, though we believe they suffer from defects, have by no means been deprived of significance and importance in the mystery of salvation. For the spirit of Christ has not refrained from using them as means of salvation which derive their efficacy from the very fullness of grace and truth entrusted to the Catholic Church”‌.

The lack of unity among Christians is certainly a wound for the Church; not in the sense that she is deprived of her unity, but “in that it hinders the complete fulfilment of her universality in history”‌. Congragation for the Doctrine of the Faith, Dominus Iesus: On the Unicity and Salvific Universality of Jesus Christ and the Church, Joseph Card. Ratzinger, August 6, 2000.