Why Is the Pope Necessary?

A necessity of divine right, not mere expediency

The word “necessary” can be understood in two ways. One can say something is necessary because it is practical — like a secretariat or an organization. Or one can say it is necessary because God willed it: it then belongs to the very constitution of the Church, and cannot be removed without distorting what Christ founded. It is in this second, strong sense that the Catholic faith affirms the necessity of the pope.

The First Vatican Council (1870) defined that the primacy of Peter is transmitted to his successors by the institution of Christ and by divine right (iure divino): it is neither a late custom nor a revocable human arrangement^[2]. This does not mean that God dictated the Vatican’s organizational chart, but that the office of confirming his brothers in the faith is willed by the Lord and must last as long as the Church itself.

“If anyone says that it is not by the institution of Christ himself, that is, by divine right, that the blessed Peter has perpetual successors in his primacy over the whole Church, or that the Roman Pontiff is not the successor of blessed Peter in the same primacy, let him be anathema.” — First Vatican Council, constitution Pastor Aeternus, July 18, 1870^[3]

The pope is not a “super-Christian”

We must immediately reject a caricature. To affirm that the pope is necessary does not mean he is a man superior to others, holier or more intelligent. History counts mediocre popes, and even some frankly unworthy ones — without this ever destroying the Church. The necessity spoken of is that of a function serving communion, not of personal excellence. The pope is first, according to the title made famous by Saint Gregory the Great, the servant of the servants of God^[4]. His greatness is that of service, not domination^[5].

All doctrine rests on a Gospel fact: among the Twelve, Jesus singled out one apostle, changed his name, and entrusted him with a unique mission. Three major New Testament texts show this, and the Church has always read them together.

“You are Peter”: the rock and the keys

At Caesarea Philippi, after Simon confesses that Jesus is “the Christ, the Son of the living God,” the Lord responds with solemn words of immense weight:

“You are Peter, and on this rock I will build my Church, and the gates of Hades shall not prevail against it. I will give you the keys of the kingdom of heaven: whatever you bind on earth shall be held in heaven as bound, and whatever you loose on earth shall be held in heaven as loosed.” — Jesus to Simon Peter, Gospel of Matthew 16:18-19^[6]

Three images concentrate here the charge entrusted to Peter. The name first: Jesus changes Simon’s name to Kêphâ (the “rock” in Aramaic), a gesture that in the Bible always signals a new mission received from God. The rock next: Peter becomes the visible human foundation on which Christ builds his Church—a secondary and shared foundation, for Christ alone is the cornerstone. The keys finally: in biblical language (cf. Is 22:22), handing over the keys of a house institutes a steward with real authority who acts in the name of the absent master^[7].

“Strengthen your brothers”: the unfailing faith

At the Last Supper, at the very moment when he announces that Satan will sift the apostles like wheat, Jesus turns to Peter—and to him alone—for a singular promise:

“Simon, Simon, behold, Satan demanded to have you, to sift you like wheat; but I have prayed for you that your faith may not fail. And when you have turned back, strengthen your brothers.” — Jesus to Peter, Gospel of Luke 22:31-32^[8]

The detail is decisive: Jesus prays that Peter’s faith will not fail, so that Peter, in turn, may strengthen the others. The Petrine charge is therefore not primarily a power, but a responsibility of faith: to keep the brothers in the truth when trial scatters them. This is the scriptural seed of what tradition would later call the pope’s mission to confirm the Church in faith.

“Feed my sheep”: the charge of the flock

After the Resurrection, by the Sea of Tiberias, Christ restores Peter—who had denied him three times—with a threefold declaration of love, and entrusts him with his entire flock:

“When they had finished breakfast, Jesus said to Simon Peter, ‘Simon, son of John, do you love me?’… He said to him, ‘Tend my lambs… Be shepherd to my sheep… Tend my sheep.’” — Jesus to Peter, Gospel of John 21:15-17^[9]

Here, it is no longer just some sheep entrusted to Peter, but the whole flock of Christ—lambs and sheep alike. The Good Shepherd, who is about to ascend to the Father, gives a visible shepherd to lead his Church in his name. The three texts correspond: to Peter the rock (Mt 16), to Peter the faith that strengthens (Lk 22), to Peter the flock to shepherd (Jn 21). The Church did not invent the papacy: she received a Peter.

Christ is the invisible head; the pope, the visible shepherd

An objection immediately comes to mind: doesn’t the Church already have a head, Christ? Yes. Christ is, and remains forever, the sole head of the Church, its cornerstone, its founder and Lord^[10]. But precisely because Christ willed a visible Church—a body made of men, with visible sacraments, a proclaimed faith, ordained pastors—he needed a visible principle of unity as well. The Catechism expresses this in a clear formula:

“The Pope, Bishop of Rome and successor of Saint Peter, is the perpetual and visible source and foundation of the unity both of the bishops and of the whole company of the faithful.” — Catechism of the Catholic Church, § 882^[11]

In other words: Christ governs his Church invisibly by his Spirit; but he willed that this spiritual unity have on earth a visible sign and instrument. The pope does not usurp Christ’s place: he represents it, as a steward represents the master. This is the full meaning of the ancient title vicar—one who holds the place of another.

Unity needs a center

Perhaps the simplest image is that of a family or a people: as long as there is a point of reference recognized by all, unity holds; as soon as everyone becomes their own final judge, division sets in. Vatican II takes up this logic: the bishops, scattered throughout the world, form a united college only if they are in communion with their head, the bishop of Rome^[12]. Without this head, there would no longer be a Church, but a federation of local Churches, each free to define its own faith.

“So that the episcopate itself might be one and undivided, [Christ] set the blessed Peter over the other apostles and established in his person the perpetual and visible principle and foundation of the unity of the faith and of the communion.” — Vatican II Council, constitution Lumen Gentium, § 18^[13]

Proof by absence: dispersion without Peter

The most striking argument for a modern mind is perhaps empirical. What happens when Christian communities reject the principle of a visible head? Sixteenth-century Protestantism, born from a refusal of Roman authority in the name of Scripture alone, fragmented into a multitude of rival confessions—Lutherans, Reformed, Anglicans, Baptists, Methodists, then — according to the censuses of world Christianity, which count each Christian group country by country, all confessions combined — tens of thousands of denominations so counted^[14], unable to agree on central points such as baptism, the Eucharist, or morality. Lacking a recognized arbiter, each private interpreter became his own magisterium. This is not polemics: it is the conclusion drawn from historical experience. Where the visible principle of unity is lacking, visible unity is also lacking.

The Catholic faith does not read the Gospel alone: it reads it with the Fathers. From the earliest centuries, the Church recognized in the Church of Rome — that of Peter and Paul — a unique place, a role of reference and center of communion.

The Fathers and the "Chair of Peter"

Around the year 180, Saint Irenaeus of Lyon, who was combating Gnostic heresies, designated the Church of Rome as the necessary meeting point of all the Churches:

“With this Church, because of its more excellent origin, all the Church, that is, the faithful everywhere, must necessarily agree.” — Saint Irenaeus of Lyon, Against Heresies, III, 3, 2, around 180^[15]

Half a century later, Saint Cyprian of Carthage called the Roman Church “the principal Church from which the priestly unity has come forth”^[16]. And in the 4th century, Saint Jerome, immersed in the Eastern controversies, wrote to Pope Damasus a famous letter in which he made communion with the chair of Peter the very criterion of belonging to the Church of Christ:

“I, who am the disciple of no other leader but Christ, am united in communion with Your Beatitude, that is, with the chair of Peter. On this rock, I know, the Church is built.” — Saint Jerome, Letter 15 to Pope Damasus, around 376^[17]

These voices are not isolated: they express a common consciousness of the ancient Church. To be Christian is to be in communion with the See of Peter.

“Peter spoke through Leo”: the Conciliar Reflex

The most striking episode occurred at the Council of Chalcedon in 451, one of the greatest councils in history. To resolve the Christological crisis raised by Monophysitism—the error that recognizes in Christ only one nature, instead of two natures, divine and human, united without confusion—, the assembled Fathers — more than five hundred bishops, almost all Eastern — had the doctrinal letter of the pope, the Tome to Flavian, read aloud. At the end of the reading, the entire assembly rose and exclaimed:

“Peter has spoken through the mouth of Leo!” — Acclamation of the Fathers of the Council of Chalcedon, 451^[18]

This spontaneous cry from a predominantly Eastern council says it all: for the Church of the early centuries, the voice of the successor of Peter was received as the guarantee of right faith. The pope did not impose an opinion from outside; he confirmed his brothers, exactly as Jesus had asked Peter (Lk 22:32). When the Greek East and Latin West were briefly reunited at the Council of Florence (1439), it was again the primacy of the Roman pontiff that was solemnly recognized on both sides—with the sole exception of Mark of Ephesus, the only Eastern bishop to refuse to sign the bull of union^[19].

Two councils have defined the doctrine of the Petrine ministry: Vatican I defined it regarding the pope’s authority; Vatican II reinserted it into the communion of the entire college of bishops. The two complement each other.

The table below summarizes the respective contributions of these two councils, often wrongly opposed as if they contradicted each other.

Vatican I: Primacy of Jurisdiction

In 1870, in the face of Gallicanism and Conciliarism that sought to subject the pope to a council or to states, the First Vatican Council defined that the Roman pontiff possesses a real, ordinary, and immediate primacy of jurisdiction over the entire Church, and not merely a primacy of honor^[20]. This power is not tyranny: it is ordered to the safeguarding of unity and faith, and it is exercised with respect for the proper rights of bishops.

Vatican II: The Pope at the Heart of the College of Bishops

Nearly a century later, the Second Vatican Council balanced and deepened this doctrine without retracting anything. It showed that the pope is not an isolated monarch, but the head of a college: the bishops, united to the Roman pontiff and never without him, together bear the care of the whole Church^[21]. The pope’s primacy and the collegiality of bishops are therefore not opposed: the pope is what makes the college one. This is the full light of Lumen Gentium:

“The Roman Pontiff, as successor of Peter, is the perpetual and visible principle and foundation of the unity of the episcopal body as well as of the multitude of the faithful.” — Second Vatican Council, Lumen Gentium, § 23^[22]

"The pope is just one bishop among others"

This is the classic Orthodox objection: all bishops are equal, and the bishop of Rome has only a primacy of honor, without real authority. Yet the Gospel texts do not entrust the same charge to all. Jesus says to Peter — and not to the indistinct college — “you are the rock,” “strengthen your brothers,” “feed my sheep.” The Council of Chalcedon, an Eastern council, acclaimed Leo as the voice of Peter. A mere ceremonial precedence would explain neither these words nor the constant practice of the ancient Church to turn to Rome to resolve major crises. The primacy of Peter is a primacy of service and governance, not just of rank.

"Jesus never intended to found a papacy"

It is objected that Jesus announced his imminent return and did not think to organize a lasting institution. But the Gospel shows exactly the opposite: he chose Twelve apostles, a structure clearly meant to endure (the new Israel), and placed one of them at their head. The change of Simon’s name to Peter only makes sense looking forward: one does not make a man “the rock” of a building one does not intend to construct. The later development of the Petrine ministry is not a betrayal of Christ’s intention but its organic unfolding in history — what Cardinal Newman called the homogeneous development of doctrine^[23].

"The Bible alone is enough: no need for a pope"

This is the Protestant objection of sola scriptura. But it turns against itself. Scripture itself does not list its own books: it was the Church, gathered around the successors of the apostles, that discerned and fixed the canon of Scripture in the 4th–5th centuries. A Bible without a Church to interpret it with authority does not produce unity but a multiplication of contradictory readings — as the Protestant reality demonstrates. The Word of God and the living ministry that guards it are not competitors: the latter serves the former. On this ground, the decisive argument is not confessional but historical: without recognized authority, no community has ever maintained the unity of its faith over time.

"The first centuries were ignorant of the papacy"

The objection claims that the papacy is a medieval invention. The sources say otherwise. As early as the end of the 1st century, Pope Clement of Rome intervened with authority in the affairs of the distant Church of Corinth^[24]. In the 2nd century, Irenaeus made agreement with Rome the criterion of true faith. In the 3rd century, Cyprian spoke of the “principal Church.” In the 5th century, an Eastern council acclaimed the voice of Peter in Pope Leo. The Petrine ministry did not arise in the Middle Ages: it has grown since the origins, like an acorn becoming an oak. What develops over the centuries is not the existence of the primacy but the precision with which the Church formulates its doctrine.

"Orthodoxy has preserved the faith without a pope"

The Orthodox Churches have preserved immense treasures: valid sacraments, apostolic succession, a liturgy of great beauty, an intact Trinitarian and Christological faith. The Catholic Church recognizes this with respect and calls them its sister Churches^[25]. But history also shows the fragility of a communion deprived of a visible center: since the schism of 1054, Orthodoxy, lacking a unity instance recognized by all its autocephalous Churches—that is, self-governing, without a common central authority—, struggles to speak with one voice and itself experiences internal breaks in communion—including the rupture between the Patriarchate of Moscow and the Ecumenical Patriarchate of Constantinople, which occurred in October 2018 and is still ongoing^[26]. The pope is not a Roman luxury: he is Christ’s answer to the permanent need for a point of unity that no one else can hold.

To fully understand his necessity, three misunderstandings must be set aside, as many reject the papacy because of a false image they have of it.

The pope is not impeccable: he can sin, err in his private life, or lack judgment in governance. The Catholic faith does not guarantee him any sanctity. The pope is not a permanent oracle: infallibility does not cover his opinions, interviews, or political choices, but only, under very strict conditions, the solemn proclamation of the faith of the entire Church — this is the subject of the article What is papal infallibility?. The pope is not the owner of the Church: he is her servant, also bound to the Word of God and Tradition, which he cannot change or contradict. His role is not to dominate the faith, but to guard it.

Ultimately, the necessity of the pope is not a burdensome constraint: it is a grace offered to the Church. By giving his flock a visible shepherd, Christ did not want to crush the freedom of believers, but to spare them the anguish of searching alone, each for himself, where the truth lies. The successor of Peter is this stable landmark amid storms — “so that your faith may not fail” — the tangible sign that the Church, despite her weaknesses, remains one throughout the centuries.

“Where Peter is, there is the Church; where the Church is, there is no death, but eternal life.” — Saint Ambrose of Milan^[27]

That is why, beyond debates, praying for the pope and with the pope has always been, for the saints, a reflex of faith: not out of worship of the man, but out of love for the unity that Christ entrusted to a poor fisherman from Galilee, and through him, to his successors until the end of the world.

• Can the Pope Err? — the real limits of papal authority.
• What is Papal Infallibility? — when and how the pope binds the Church.
• Why Does the Catholic Church Speak of Apostolic Succession? — the unbroken chain from the apostles.
• What Is the Origin of the Catholic Church? — the Church founded by Christ on Peter.
• Why Does the Church Say It Is One, Holy, Catholic, and Apostolic? — the four marks of the Church.
• Can One Be Christian Without a Church? — the communal dimension of faith.
• What Does the Church Say About the Orthodox? — proximity and difference with the Eastern Churches.