Authority in the New Testament
The New Testament does not present a church without structure. From Christ's commission of the Twelve to Paul's appointment of elders in every city, authority is real, specific, and theologically grounded. The question is not whether the church has authority, but where that authority comes from and how it is transmitted.
The Apostolic Commission
All church authority is derivative — grounded in and bounded by the authority Christ received from the Father:
All authority 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, to the end of the age. Matthew 28:18–20
The apostles are commissioned as Christ's authorized agents — apostolos (sent ones). Their authority is not inherent to their persons; it is delegated from Christ and bounded by his commands. Paul explicitly grounds his apostolic claim not in human appointment but in a direct encounter with the risen Lord (Galatians 1:1; 1 Corinthians 9:1). The Twelve function as a founding layer — "built on the foundation of the apostles and prophets, Christ Jesus himself being the cornerstone" (Ephesians 2:20).
"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" (Matthew 16:19). Three interpretive traditions exist regarding the "rock" on which the church is built: (1) Peter personally — the rock is Peter, whose unique authority passes to his successors in Rome (Roman Catholic, some patristic voices including Origen in one strand, Cyprian); (2) Peter's confession — the rock is the truth Peter confessed ("you are the Christ, the Son of the living God"), not the man who confessed it (Augustine, Calvin, the Reformed tradition); (3) Christ himself — Peter is the representative speaker; Christ remains the only foundation (1 Corinthians 3:11), as several Eastern Fathers (Chrysostom, Ambrose) argue. Crucially, the binding-and-loosing authority given to Peter in Matthew 16 is extended to all the apostles collectively in Matthew 18:18 and to the gathered disciples in John 20:23 — which weakens any case for an exclusively Petrine monarchy.
Elders, Overseers, and Deacons
The NT presents a functioning church order with defined offices and qualifications. Paul appoints elders in every church he plants (Acts 14:23; Titus 1:5). The qualifications for overseers (episkopoi) and elders (presbyteroi) are set out in 1 Timothy 3:1–7 and Titus 1:6–9. Deacons serve under them (Philippians 1:1; 1 Timothy 3:8–13).
The Congregation's Authority
Authority in the NT is not lodged only in officers. The congregation itself has a genuine role. In Matthew 18:17 the final step of church discipline is "tell it to the church" — the assembled body, not only its leaders. In 1 Corinthians 5:4–5 Paul addresses the entire Corinthian church and urges them to exercise discipline collectively. Paul commends the Bereans for testing his own preaching against Scripture (Acts 17:11), and the Galatians are told that even an apostle who preaches a different gospel is under a curse (Galatians 1:8). This places a real, if bounded, authority in the whole assembly and in Scripture itself that no officer can override.
NT authority is structured but bounded. Officers have real authority — to teach, discipline, and administer the sacraments — but that authority is bounded above by Scripture and the apostolic deposit, and is accountable laterally to the congregation they serve. No NT text supports unchecked, infallible authority concentrated in a single human officer.
The Tradition Texts
One of the most important facts about the NT's view of authority is that the NT authors themselves invoke paradosis (tradition, handing-on) as a positive, binding category — not tradition in the pejorative sense Jesus condemned in the Pharisees (Mark 7:8: "human tradition" that nullifies the word of God), but the apostolic deposit entrusted to the church and transmitted through it.
The Key Texts
So then, brothers, stand firm and hold to the traditions that you were taught by us, either by our spoken word or by our letter. 2 Thessalonians 2:15
This is among the most direct NT affirmations of tradition as a binding authority. Paul places spoken word and letter on equal footing — both are apostolic tradition, both are to be held. The Catholic and Orthodox traditions cite this as evidence that the apostolic deposit was larger than what was eventually written down and that the unwritten oral tradition carries binding authority alongside Scripture.
I commend you because you remember me in everything and maintain the traditions even as I delivered them to you. 1 Corinthians 11:2
For I received from the Lord what I also delivered to you, that the Lord Jesus on the night when he was betrayed took bread… 1 Corinthians 11:23
The technical vocabulary of tradition is explicit here: parelabon (I received) and paredōka (I delivered/passed on). Paul uses precisely the same language in 1 Corinthians 15:3 for the resurrection kerygma: "For I delivered to you as of first importance what I also received…" This chain of receiving and handing-on is the structure of apostolic authority in the NT.
And what you have heard from me in the presence of many witnesses entrust to faithful men, who will be able to teach others also. 2 Timothy 2:2
Four generations of transmission are implied: Paul → Timothy → faithful men → others. This is the most explicit NT warrant for the concept of apostolic succession — the chain of authorized teachers transmitting the apostolic deposit. Notice what is being transmitted: what you have heard from me — not autonomous authority, but a received content.
Beloved, although I was very eager to write to you about our common salvation, I found it necessary to write appealing to you to contend for the faith that was once for all delivered to the saints. Jude 3
The faith was "once for all delivered" (hapax paradotheisē) — a completed deposit, not an ongoing revelation. This phrase is the strongest Protestant argument that the apostolic tradition was closed with the apostolic generation and is fully accessible in the NT canon. Development, in this view, can clarify but cannot add to the deposit.
Protestant exegetes (Bavinck, Murray, Frame) argue that the oral apostolic tradition was always intended to be inscripturated. The letters of Paul, written to preserve and apply the apostolic deposit to specific churches, themselves became Scripture. Once the canonical process was complete, the "tradition" Paul commends in 2 Thessalonians 2:15 is fully accessible in the NT — there is no separable oral deposit that supplements or corrects it. Jude 3's "once for all delivered" is read as closing the canon of authoritative tradition to the apostolic generation.
Catholic and Orthodox theologians (Yves Congar, Tradition and Traditions, 1966; John Meyendorff) argue that the NT itself was written within the tradition — it presupposes a community, a liturgy, a practice (baptism, eucharist, creed). The Church transmitted both the books and the reading of the books; you cannot separate the written text from the community that produced, recognized, and interprets it. The tradition is not a separate content alongside Scripture; it is the living context in which Scripture has always been read.
The tradition texts in the NT prevent any Christian from treating the church's history as irrelevant. Even the strictest Protestant who reads only Scripture is reading it in a language, with an assumed canon, using interpretive habits shaped by centuries of the church's work. The question is not whether to receive a tradition, but which tradition is faithful to the apostolic deposit — and by what standard that faithfulness is judged.
The Jerusalem Council — A Working Model
Acts 15 is the most important NT example of church authority being exercised in practice. It is the template that Orthodox and Catholic ecclesiology appeals to for conciliar authority, and the text Protestant ecclesiology must also reckon with.
And after there had been much debate, Peter stood up and said to them, "Brothers, you know that in the early days God made a choice among you, that by my mouth the Gentiles should hear the word of the gospel and believe…" And all the assembly fell silent, and they listened to Barnabas and Paul as they related what signs and wonders God had done through them among the Gentiles. After they finished speaking, James replied… Acts 15:7–13
For it has seemed good to the Holy Spirit and to us to lay on you no greater burden than these requirements… Acts 15:28
Several features of Acts 15 are theologically significant:
The Spirit does not bypass reason, argument, or testimony. The council hears Peter's theological argument from God's action (vv.7–11), the empirical testimony of Paul and Barnabas (v.12), and James's scriptural argument from Amos 9:11–12 (vv.15–17). The decision emerges through a process that is simultaneously Spirit-guided and fully human. This is the pattern Orthodox and Catholic conciliarism appeals to: the Spirit speaks through the assembled body reasoning together from Scripture and experience.
It is James who sums up the debate, cites Scripture, and issues the binding conclusion (v.13–21). James was not one of the original Twelve; he was the Lord's brother who became the leader of the Jerusalem church (Galatians 1:19; 2:9). This complicates both a strict Petrine-primacy argument (Peter is not the presider) and a rigid apostolic-succession argument (James was not one of the Twelve). Authority here belongs to the assembly under its recognized leader, grounded in scriptural reasoning.
The letter is carried to Antioch, Syria, and Cilicia (Acts 15:23) and binds those churches. This is the NT warrant for the authority of councils over individual congregations. It is also the warrant for inter-church accountability: no local church in the NT is a self-contained authority immune from wider correction.
The Canon Problem
The most difficult challenge for any authority theory is the question of the biblical canon itself. The NT canon was not formally settled until the late fourth century. This creates a genuine historical problem that every tradition must address.
The Timeline
The NT books were written between approximately AD 48 (Galatians) and AD 100 (Revelation). But they circulated separately — letter by letter, Gospel by Gospel — for decades before anyone attempted to list the authoritative corpus. Key dates:
- c. AD 140: Marcion creates the first known canon — a truncated list excluding the OT and most Gospels, forcing the church to articulate its own canonical boundaries.
- c. AD 180: Irenaeus of Lyons argues for four Gospels on theological grounds, the earliest substantial canonical argument.
- c. AD 200: The Muratorian Fragment lists most NT books, excluding Hebrews, James, 1–2 Peter, and 3 John.
- AD 367: Athanasius of Alexandria's Festal Letter 39 — the earliest document listing all 27 NT books exactly as Protestants receive them today.
- AD 393 / 397 / 419: Councils of Hippo and Carthage affirm the same 27-book canon.
The most penetrating challenge to sola scriptura is this: if Scripture is the sole authority, by what authority did the church decide which books constitute Scripture? The canon is not self-identifying — Hebrews, James, 2 Peter, 2–3 John, and Revelation were disputed for centuries. The church recognized these books, but that recognition involved an exercise of authority. If the church's authority was sufficient to close the canon, why is it insufficient to define doctrine? As Catholic apologist John Henry Newman argued, "to be deep in history is to cease to be a Protestant" (Development of Doctrine, 1845) — the church that gave us the Bible must have some continuing authority to interpret it.
The Protestant response, most carefully developed by Michael Kruger (Canon Revisited, 2012), distinguishes between the canon's ontological and epistemological authority. The books of the NT were authoritative from the moment of writing, not from the moment of ecclesiastical recognition. The church's judgment was a fallible but generally reliable recognition of what God had already determined — comparable to how we recognize gold without having created gold. The internal testimony of the Holy Spirit gives the believer a principled basis for receiving the canon without depending on the church's infallibility. Furthermore, the Spirit's guidance in canonical recognition does not entail the church's infallibility in doctrinal development — the two are separate questions.
From Apostles to Bishops — Historical Development
The trajectory from the NT's flexible plural eldership to the monarchical episcopate of the second century, and then to the papacy of the medieval church, is the central historical question in ecclesiology. Each step in this development was contested at the time and remains contested today.
The Apostolic Fathers (c. AD 70–150)
The generation after the apostles worked urgently to preserve and transmit what they had received. Three figures are indispensable:
The church at Rome writes to the church at Corinth to rebuke them for deposing their presbyters. Clement grounds the church's structure in divine appointment: "The apostles preached to us the gospel from the Lord Jesus Christ… They appointed those [ministers], and afterwards gave instructions that when these should fall asleep, other approved men should succeed to their ministry." This is the earliest extant argument for apostolic succession as the basis of church order. Clement does not yet claim a Roman papacy; he writes as one community to another. But the assumption of inter-church accountability is clear.
Ignatius, writing on his way to martyrdom in Rome, is the most explicit early advocate of one bishop per city with presbyters and deacons subordinate to him: "Do nothing without the bishop… Let that be considered a valid Eucharist which is celebrated by the bishop, or by one whom he appoints" (Letter to the Smyrnaeans, 8). "Where the bishop is, there let the multitude of believers be; even as where Jesus is, there is the catholic church" (Letter to the Smyrnaeans, 8). Whether Ignatius reflects universal practice or is promoting a model not yet universal is debated — but his letters are the earliest clear evidence of the episcopal structure that would become standard throughout the church by the late second century.
Irenaeus develops the first systematic theology of apostolic succession against the Gnostics (Against Heresies, III.1–5). His argument is not primarily about the bishop's sacramental power but about the doctrinal content of the succession: "It is within the power of all, therefore, in every church, who may wish to see the truth, to contemplate clearly the tradition of the apostles manifested throughout the whole world; and we are in a position to reckon up those who were by the apostles instituted bishops in the churches, and to demonstrate the succession of these men to our own times." The key move: any group claiming secret apostolic knowledge (the Gnostics) cannot produce a traceable succession; the catholic church can. Apostolic succession is a historical argument for the reliability of catholic doctrine, not a magical guarantee of episcopal infallibility.
The Great Councils (AD 325–787)
The ecumenical councils defined Christian doctrine in response to heresy, operating on the principle that the Spirit guides the assembled bishops. Their decisions were received as binding by the churches — but their authority was recognized concretely only where their doctrinal conclusions were faithful to Scripture and the apostolic deposit. Councils that weren't received (the "Robber Council" of Ephesus, AD 449; the Iconoclast councils of the 8th century) demonstrate that reception was not automatic.
| Council | Date | Issue | Decision |
|---|---|---|---|
| Nicaea I | AD 325 | Arianism — is the Son a creature? | Homoousios: the Son is of the same substance as the Father. Champion: Athanasius of Alexandria. |
| Constantinople I | AD 381 | Pneumatomachians — is the Spirit fully God? | Nicene Creed completed; full deity of the Spirit affirmed. |
| Ephesus | AD 431 | Nestorianism — is Christ two persons? | Mary is Theotokos (God-bearer); Christ is one person. |
| Chalcedon | AD 451 | Eutychianism — did Christ's natures merge into one? | One person in two natures — without confusion, change, division, or separation. |
| Nicaea II | AD 787 | Iconoclasm — are images of Christ idolatry? | Distinction between latreia (worship, to God alone) and proskynesis/dulia (veneration, permissible toward images). |
Vincent of Lérins (AD 434)
Vincent's Commonitory proposes the most elegant and most contested test for authentic Christian tradition:
Moreover, in the Catholic Church itself, all possible care must be taken, that we hold that faith which has been believed everywhere, always, by all. Vincent of Lérins, Commonitory II (AD 434)
The Vincentian Canon — quod ubique, quod semper, quod ab omnibus ("what has been believed everywhere, always, and by all") — is simultaneously appealing and nearly impossible to apply consistently. Almost no doctrine survives the strictest reading: the papacy, the canon of Scripture, even the precise Trinitarian formulas of Nicaea were disputed in some quarters and unknown in others. Newman's response (Development of Christian Doctrine, 1845) was to argue that doctrine legitimately develops — the church comes to understand in fuller terms what was implicitly present from the beginning. This remains one of the most creative and contested claims in modern Catholic theology.
The East-West Schism (AD 1054)
The primary fault line of the Schism was not Trinitarian theology but ecclesiology itself — specifically, the question of papal authority. Rome claimed the universal jurisdiction of the pope as the successor of Peter; the Eastern patriarchates (Constantinople, Alexandria, Antioch, Jerusalem) accepted a primacy of honor for Rome (primus inter pares — first among equals) but rejected any universal juridical authority. The filioque controversy (does the Spirit proceed from the Father alone, or from the Father and the Son?) was the presenting issue, but Rome's unilateral addition of filioque to the Nicene Creed without an Ecumenical Council was itself an exercise of the very authority the East rejected. Mutual excommunications were issued in 1054; they were not lifted until 1964.
The Reformation (1517–)
Martin Luther did not set out to reject tradition. He appealed to Scripture and to Augustine against what he identified as medieval innovations — the sale of indulgences, the meritorious system of penance, the theology of semi-Pelagian cooperation with grace. His formal principle of authority was articulated most sharply at the Diet of Worms (1521):
Unless I am convinced by the testimony of the Scriptures or by clear reason — for I do not trust either in the pope or in councils alone, since it is well known that they have often erred and contradicted themselves — I am bound by the Scriptures I have quoted and my conscience is captive to the Word of God. Martin Luther, Diet of Worms (April 18, 1521)
This is not a rejection of tradition as such. Luther retained the Apostles' Creed, the Nicene Creed, and the Athanasian Creed; he wrote two catechisms and a liturgy. Calvin appealed extensively to the Fathers (especially Augustine, Chrysostom, and Cyprian) throughout the Institutes. The Reformation's claim was that tradition must be answerable to Scripture, not that tradition is irrelevant. The difference between this and the Catholic position is a difference about the finality of Scripture relative to tradition, not a difference about whether the church's history matters at all.
The Positions Compared
The three major Christian traditions answer the authority question differently and consistently. The table below represents the strongest articulation of each position, not a caricature.
| Question | Roman Catholic | Eastern Orthodox | Classical Protestant |
|---|---|---|---|
| Supreme authority | Scripture + Sacred Tradition, interpreted by the Magisterium (Pope + bishops in communion with him) | Scripture within Holy Tradition; the Seven Ecumenical Councils; no single human head | Scripture alone as the norma normans; tradition as subordinate witness, reformable by Scripture |
| Formal definition | Dei Verbum (Vatican II, 1965): "Sacred tradition and sacred Scripture form one sacred deposit of the word of God, committed to the Church." | The Holy Tradition is the life of the Holy Spirit in the Church; Scripture is the supreme written expression of this Tradition, not a source standing above it. | Westminster Confession I: "The supreme judge by which all controversies of religion are to be determined… can be no other but the Holy Spirit speaking in the Scripture." |
| Papal infallibility | Yes — defined at Vatican I (1870): the Pope is infallible when speaking ex cathedra on faith and morals | No — no single bishop can speak infallibly; only an Ecumenical Council received by the whole church carries that weight | No — "All synods or councils, since the apostles' times, whether general or particular, may err" (Westminster Confession, XXXI.3) |
| How doctrine develops | Newman's Development of Doctrine (1845): legitimate organic growth from implicit to explicit — Marian dogmas, purgatory, papal infallibility are developments of what was always present in seed form | Doctrine is not developed but more fully expressed and defended as heresies arise; councils articulate what was always believed, never add to the deposit | Semper reformanda — the church is always being reformed by Scripture; tradition may accumulate error and must be corrected |
| Who interprets Scripture | The Magisterium — the bishops in communion with the Pope have the authoritative charism of interpretation | The Spirit-guided Church reading together; the consensus of the Fathers; conciliar decisions | The Spirit through Scripture itself (perspicuity); the individual conscience accountable to the community; tested against the whole canon |
| OT canon | 73 books (includes Deuterocanon / Apocrypha) | Varies — typically more than 66, including some books not in the Catholic canon (3 Maccabees, 1 Esdras, Psalm 151) | 66 books (Hebrew OT canon; deuterocanon excluded or treated as secondary) |
| Key difficulty | How does one verify that a Tradition is genuinely apostolic, and not a later development? Who guards the guardian? | How does one identify a genuinely ecumenical council when no authoritative mechanism exists to call or ratify one? What happens when the tradition is genuinely unclear? | If Scripture is self-interpreting, why do sola scriptura traditions produce contradictory doctrines? And who recognized the canon without a prior authority? |
The Anglican Via Media
Anglicanism has historically tried to occupy the middle ground through what is sometimes called the "three-legged stool" (a phrase never used by Hooker but drawing on his method in Laws of Ecclesiastical Polity, 1594): Scripture, Tradition, and Reason as mutually informing sources of authority. This approach has the advantage of breadth and the disadvantage of ambiguity — it can become either a principled synthesis or a refusal to commit, depending on who is applying it.
Key Exegetical Flashpoints
The authority debate turns on a handful of texts that every tradition must interpret. Below is the strongest reading of each from the relevant tradition, and the counter-argument.
Catholic reading: The Aramaic kepha (rock) that Jesus spoke is the same word for both Peter's name and the foundation — there is no distinction. Christ is founding his church on the person of Peter, whose authority is transmitted to his successors in Rome. The parallel with Isaiah 22:22 (the key of the house of David given to Eliakim, who had successors) supports a transferable authority. Protestant counter: The Greek text does distinguish Petros (a person) from petra (bedrock), suggesting the foundation is either Peter's confession or Christ himself (1 Corinthians 3:11). The binding/loosing authority is extended to all apostles in Matthew 18:18, undermining unique Petrine primacy. Nowhere in Acts does Peter exercise the kind of universal authority his alleged primacy would suggest.
Catholic reading: Christ identifies himself with his sent emissaries — rejecting those sent by Christ is rejecting Christ himself. This extends naturally to those who succeed the apostles in the apostolic office. Protestant counter: The "you" are the Seventy-Two sent on a specific mission; the statement applies to the apostolic mission, not to all future church officers. The passage does not imply infallibility of those successors, only that the apostolic message carries Christ's own authority.
Catholic reading: The threefold commission corresponds to Peter's threefold denial, and constitutes Peter's formal installation as shepherd of the universal church — a unique commission that passed to his successors. Protestant counter: This is Peter's restoration after denial, not the founding of a papacy. The same commission to "shepherd the flock" is given to all elders in Acts 20:28 and 1 Peter 5:2 — where, notably, Peter describes himself as a "fellow elder," not a supreme shepherd.
Catholic/Orthodox reading: Christ promises ongoing Spirit-guidance to his church — the council, the magisterium, or the tradition is the Spirit's vehicle of continuing authoritative teaching. Protestant counter: The context (16:12–15) shows Jesus speaking specifically to the apostles about the Spirit completing the revelation of all that Jesus wanted to teach them — a promise of completion of the apostolic deposit, not a guarantee of ongoing infallible development. The fulfillment is the NT canon. Ongoing guidance of the Spirit in reading Scripture is a different claim from infallible guidance in defining doctrine.
This text establishes that church leadership has a real authority over members — not merely advisory, but requiring obedience and submission, since leaders will "give an account" for those in their care. The limits are set elsewhere: Galatians 1:8 places even an apostle under the gospel's judgment, and Acts 5:29 establishes that obedience to God overrides human authority. Church authority is real and binding in its proper domain — ordering the life of the community, applying Scripture, exercising discipline — but is not absolute and does not extend to commanding what God forbids.
A Balanced Assessment
The authority debate has been running for five centuries since the Reformation, and two millennia in earlier forms. An honest assessment must acknowledge what each tradition gets genuinely right, what it finds genuinely difficult, and what points appear reasonably settled from the biblical evidence regardless of tradition.
Points That Are Hard to Contest
Itinerant apostles, local elders with defined qualifications, inter-church accountability (the Jerusalem Council), and a real authority of the assembly in matters of discipline — all of these are present and assumed in the NT. Pure congregationalism with no accountability beyond the local assembly, or radical individualism that makes each believer their own final authority, is difficult to ground in Acts or the Pauline letters. The church has officers; those officers have real authority; that authority is bounded but not illusory.
The NT canon was not settled until the late fourth century. The church transmitted the gospel — orally, sacramentally, and institutionally — before any NT letter existed and before the canon was formally recognized. Some form of living, authorized transmission is inherent to Christianity. The tradition Paul commends in 2 Thessalonians 2:15 was real before any NT letter was written, and the church that recognized the canon exercised some form of real authority in doing so. This does not prove that tradition is infallible or equal to Scripture in authority; but it prevents any simplistic account in which the Bible drops from heaven and the church is irrelevant to its transmission.
Christ's promise that "the Spirit will guide you into all truth" (John 16:13) is not empty. The fact that the church, despite all its failures, has maintained the core christological and Trinitarian doctrines through twenty centuries of attack reflects something more than institutional inertia. The councils that defined Nicene theology and Chalcedonian Christology were preserving what Scripture teaches, not inventing new doctrine. Their work deserves respect even from those who do not grant councils infallible authority.
The challenge to sola scriptura — who recognized the canon by what authority? — is real and must be answered seriously, not dismissed. The challenge to tradition as a co-equal source of doctrine — how do we distinguish genuine apostolic tradition from later developments? who guards the guardian? — is equally real. Neither position escapes epistemological difficulty. The honest student will hold their position with humility and engage the strongest version of the opposing argument.
What the Evidence Does Not Support
Wherever one lands on the larger debate, several specific claims appear to go beyond what the NT evidence will bear:
- Universal papal jurisdiction in the NT — Peter is a prominent apostle with a unique role; the NT does not present him as exercising ongoing universal authority over other apostles, nor does it suggest any such authority passes to his successors in Rome. The argument for papal primacy is a development, not a datum of the NT text.
- Papal infallibility as defined at Vatican I (1870) — the claim that the Pope, when speaking ex cathedra on faith and morals, is preserved from error by the Holy Spirit — has no NT basis and was not universally held even in the medieval Catholic Church. Many Catholic theologians today hold it with significant qualification.
- The isolation of Scripture from all tradition — a bare Bible with no community, no history, and no interpretive tradition is a fiction. Every reader brings a tradition of reading; the question is whether that tradition is acknowledged, tested, and reformed by Scripture.
- The identification of any single denomination with the one true church — the NT's marks of the church (apostolicity, holiness, catholicity, unity) are found, imperfectly, in many traditions. The claim that only one institution is the true church contradicts both the NT's humility about visible ecclesial perfection and the historical evidence of genuine grace and faithfulness across traditions.
The Christian's responsibility is not to resolve the authority debate definitively — centuries of careful scholars have not done so — but to engage it honestly, read widely, hold positions with humility, and above all to test everything by the apostolic deposit as we receive it in Scripture. The church has authority; that authority is real; it is also bounded by the word of Christ which it exists to serve. The tradition that best preserves, transmits, and applies the apostolic deposit — however imperfectly — is the tradition most faithful to the commission Christ gave.
For Further Study
Tradition and Traditions, Yves Congar OP. Macmillan, 1966. The definitive Catholic study of tradition's theological basis — rigorous, historically comprehensive, and fair to Protestant objections.
The Shape of Sola Scriptura, Keith Mathison. Canon Press, 2001. Carefully distinguishes sola scriptura from nuda scriptura; the strongest modern Protestant case that tradition matters but Scripture is the norming norm.
Canon Revisited, Michael Kruger. Crossway, 2012. The most thorough Protestant treatment of how the NT canon was recognized without depending on the church's infallible authority.
An Essay on the Development of Christian Doctrine, John Henry Newman. University of Notre Dame Press, 1989 [orig. 1845]. The most creative and influential Catholic account of how doctrine legitimately develops. Essential reading for understanding the Catholic authority claim.
The Orthodox Church, Timothy Ware (Kallistos). Penguin, 1963 / 1993. Clear, readable, and sympathetic account of the Orthodox understanding of Tradition, councils, and authority; the standard introduction.
Reformed Dogmatics, Vol. 1, Herman Bavinck. Baker Academic, 2003 [orig. 1906]. The most rigorous Reformed treatment of Scripture and tradition; §§ on principia theologiae directly engage the Catholic position at its strongest.
Against Heresies, Irenaeus of Lyons. c. AD 180. Public domain. Books III–IV develop the earliest systematic argument for apostolic succession as the guarantee of doctrinal fidelity — the patristic source both Catholic and Protestant arguments cite.
Letters, Ignatius of Antioch. c. AD 107–110. Public domain. Seven letters written on the way to martyrdom — the first explicit advocacy of the monarchical episcopate, and a primary source for any discussion of early church order.