How to Talk to Protestants about Authority

Q: How can I explain Catholic Tradition without making it sound like extra-biblical doctrine?

Frame Tradition as the living context in which Scripture has always been read—not a separate body of revelation. The earliest Christians had no New Testament; the canon itself was discerned within a worshiping, teaching Church. The Catholic claim is that this same Church continues to read Scripture in continuity with the apostles, not that the Church reads alongside or above Scripture.

What seems to me white, I will believe black if the hierarchical Church so defines.

— Ignatius of Loyola, The Spiritual Exercises, “Rules for Thinking with the Church,” rule 13.

Few sentences capture the Catholic posture toward authority more starkly than that one. To Protestant ears it can sound like an abdication of conscience; to Catholic ears it is a confession that the Church is not just a community of like-minded readers of the Bible but the visible Body of Christ, capable of binding judgment. The gap between those two hearings is what makes Catholic-Protestant dialogue about authority hard—and what makes it worth doing.

Protestants and Catholics hold very different views of theological authority. Protestants point to Scripture alone, while the Catholic position is more complex: Scripture is received within the whole of the Church’s Tradition, which includes the Sacred Scriptures themselves, the Fathers of the Church, the sacred liturgy, and the Magisterium that the Holy Spirit assists.⁠¹

While sola scriptura deserves its own treatment, the practical question for now is how to talk to Protestants about authority in a way that makes the Catholic view intelligible from inside a Protestant frame of reference.

Authority of Scripture

Scripture is the natural starting point because it is the only source both traditions already accept as divinely inspired. A Catholic who grounds an argument in the biblical text speaks in a register a Protestant interlocutor recognizes as authoritative—and that recognition is what opens the door to everything else.

When speaking with Protestants, appealing to a common source of authority will go far in promoting understanding and agreement. Both Protestants and Catholics accept Scripture as divinely inspired and inerrant in what it teaches for the sake of our salvation, and so Scripture should serve as the starting point in any discussion about religious authority.⁠²

Protestant theology provides room for a wide range of scriptural interpretations to coexist. Protestants are therefore accustomed to accepting different theological systems as valid interpretations of Scripture, even where they personally disagree with the conclusions such theologies present.⁠³

By grounding a discussion of Catholic doctrine in Scripture, Catholics can gain at least reluctant acceptance of the validity of their beliefs. This is the first step in building understanding, particularly among evangelicals with their long history of suspicion of anything Roman.

A few passages do disproportionate work in these conversations. Matthew 16:18–19 on the keys; 1 Timothy 3:15 on the Church as “the pillar and bulwark of the truth”; 2 Thessalonians 2:15 on holding fast to the traditions taught “by word of mouth or by our letter”; 1 Corinthians 11:2 on receiving the apostolic traditions. None of these proves the Catholic position by itself, but each makes the Catholic reading more plausible than the caricature.

When the conversation begins on shared scriptural ground, even a reluctant interlocutor can recognize the Catholic case as a reading rather than an invention.

The Church Fathers

Protestants tend to idealize the early Church, viewing it as the period before doctrinal corruption set in. The Apostolic Fathers and the Ante-Nicene Fathers therefore carry weight with Protestants in a way that medieval scholastics or modern magisterial documents do not.

Catholics can leverage this by grounding arguments in the Fathers themselves rather than in later authorities. A few examples carry particular weight:

Ignatius of Antioch on the bishop. Writing around AD 107 on his way to martyrdom, Ignatius tells the Smyrnaeans, “Wherever the bishop appears, there let the congregation be; just as wherever Jesus Christ is, there is the catholic Church.”⁠⁴
Irenaeus on apostolic succession. Around AD 180, Irenaeus traces the line of bishops at Rome from Peter and Paul down to his own day, arguing that the apostolic faith is preserved in the Church through this succession.⁠⁵
Cyprian on the unity of the Church. Around AD 251, Cyprian writes, “He can no longer have God for his Father who has not the Church for his mother,” framing visible ecclesial unity as inseparable from the gospel itself.⁠⁶
Augustine on the sacraments. In a famous gloss on John 15:3, Augustine teaches that “the word is added to the element, and there results the sacrament,” tying sacramental efficacy to the Church’s apostolic ministry.⁠⁷

These figures speak from the same historical period that Protestants themselves treat as the Christian gold standard, and they consistently witness to recognizably Catholic doctrine and practice. A Protestant who is willing to grant the Fathers any deliberative weight at all will find that their testimony pulls toward the Catholic shape of the Church rather than away from it.

The Catholic Method

Catholics approach theology communally rather than individualistically. The Church predates the biblical canon by centuries: the earliest Christians relied on the oral teaching of the apostles and their successors before any New Testament book was written, and the canon itself was discerned within the Church’s liturgical and conciliar life.⁠⁸ Scripture itself acknowledges this: Paul tells the Thessalonians to “hold fast to the traditions that you were taught by us, either by word of mouth or by our letter” (2 Thessalonians 2:15).

By emphasizing your high regard for Scripture first, you establish that Tradition supplements rather than replaces it. Tradition, on the Catholic view, is the living context in which Scripture is received and interpreted across generations—not an additional pile of doctrines bolted on after the fact. The Magisterium is then introduced as the Church’s servant of the Word, charged with guarding and explicating what has been received, rather than as a competing source of revelation.⁠⁹

The Goal

The goal is not to win an argument in a single sitting; it is to make Catholic claims intelligible inside a Protestant frame of reference. Protestants will not necessarily adopt the Catholic methodology after one conversation, or even after many—but conversations framed this way tend to produce understanding rather than suspicion, and understanding is the soil in which any further movement grows.

Effective teaching requires adapting to the culture and context of the listener. Protestantism and Catholicism are, in real ways, distinct theological cultures. They require different doors of approach, even when the destination is the same.

For more on the wider strategy this post belongs to, see How to Talk to Protestants—the parent post in the series—and How to Talk to Protestants about Divine Revelation, which applies the same dialogue method to the doctrine of revelation itself.

Frequently Asked Questions

What’s the best way for a Catholic to start a conversation with a Protestant about authority?

Start on Scripture. Both traditions affirm the divine inspiration of the biblical text, so the Bible is the only source of authority that does not need to be argued for before the conversation can begin. From shared scriptural ground a Catholic can move outward—to the early Church’s reception of Scripture, to the Fathers, and only then to the Magisterium and the Catechism.

Why does Scripture matter as a starting point for Catholic-Protestant dialogue?

Because it is the one authority both sides already accept. Beginning with Catholic Tradition or papal documents would require persuading a Protestant to accept those sources before any actual theological work could happen. Beginning with Scripture skips that step. It also clears away a common Protestant suspicion that Catholics treat Tradition as a substitute for, rather than a context for, the Bible.

How can I explain Catholic Tradition without making it sound like extra-biblical doctrine?

Frame Tradition as the living context in which Scripture has always been read—not a separate body of revelation. The earliest Christians had no New Testament; the canon itself was discerned within a worshiping, teaching Church. The Catholic claim is that this same Church continues to read Scripture in continuity with the apostles, not that the Church reads alongside or above Scripture. The longer treatment is here.

Which Church Fathers are most useful in dialogue with Protestants?

Apostolic Fathers and Ante-Nicene Fathers carry the most weight, because Protestants generally idealize the early Church before what they take to be medieval corruption. Ignatius of Antioch, Irenaeus, Cyprian, and Augustine are particularly useful: they witness to the bishop, apostolic succession, the visible unity of the Church, and sacramental theology—all in language Protestants find harder to dismiss as a later development.

Will appealing to the Fathers really persuade a Protestant?

Not always, and rarely on the first pass. The point is not to win the argument by overwhelming citation but to demonstrate that recognizably Catholic doctrine and practice were already in place during the period Protestants treat as normative. Even where the appeal does not change a Protestant’s position, it consistently changes how they hear the Catholic case—from “novel medieval invention” to “continuous with the early Church”.

Is the goal of this kind of dialogue conversion?

No. The goal is mutual understanding and the dismantling of caricature. Conversion is the Holy Spirit’s work, not the dialogue partner’s; what dialogue can do is make accurate Catholic claims intelligible from inside a Protestant frame of reference. That is enough—and it is what charity and intellectual honesty actually require.

Footnotes

1. See Catechism of the Catholic Church, §688, which describes the Church as the place where we know the Holy Spirit “in the Scriptures he inspired; in the Tradition, to which the Church Fathers are always timely witnesses; in the Church's Magisterium, which he assists; in the sacramental liturgy.” Cf. Dei Verbum §10 on Scripture and Tradition forming “one sacred deposit of the word of God.”
2. On the Catholic doctrine of inspiration and inerrancy, see Dei Verbum §11. The qualifier “for the sake of our salvation” is Vatican II's own; see Joseph Ratzinger's commentary in Herbert Vorgrimler, ed., Commentary on the Documents of Vatican II, vol. 3 (New York: Crossroad, 1989).
3. Alister E. McGrath, The Intellectual Origins of the European Reformation, 2nd ed. (Oxford: Blackwell, 2004), describes how, in the absence of definitive magisterial pronouncements, “a self-perpetuating doctrinal pluralism was…an inevitability” among Protestant theologians.
4. Ignatius of Antioch, Letter to the Smyrnaeans 8.2, in Michael W. Holmes, ed. and trans., The Apostolic Fathers: Greek Texts and English Translations, 3rd ed. (Grand Rapids: Baker Academic, 2007), 257.
5. Irenaeus of Lyon, Against Heresies 3.3.1–2, in Ante-Nicene Fathers, vol. 1, ed. Alexander Roberts and James Donaldson (Buffalo, NY: Christian Literature Publishing Co., 1885), accessible at New Advent.
6. Cyprian of Carthage, De Catholicae Ecclesiae Unitate 6, in Ante-Nicene Fathers, vol. 5, ed. Alexander Roberts and James Donaldson (Buffalo, NY: Christian Literature Publishing Co., 1886), accessible at New Advent.
7. Augustine of Hippo, Tractatus in Evangelium Iohannis 80.3, in Nicene and Post-Nicene Fathers, ser. 1, vol. 7, ed. Philip Schaff (Buffalo, NY: Christian Literature Publishing Co., 1888), accessible at New Advent: “Accedit verbum ad elementum, et fit sacramentum.”
8. On the historical formation of the New Testament canon within the worshiping Church, see Bruce M. Metzger, The Canon of the New Testament: Its Origin, Development, and Significance (Oxford: Clarendon Press, 1987); and for a Catholic theological reading, Joseph Ratzinger, God's Word: Scripture, Tradition, Office (San Francisco: Ignatius Press, 2008).
9. Catechism of the Catholic Church, §§85–87: “The task of giving an authentic interpretation of the Word of God…has been entrusted to the living teaching office of the Church alone…[which] is not superior to the Word of God, but is its servant” (quoting Dei Verbum §10).