What Do We Mean by "Canon"?

Introduction

Before we can ask which books belong in the Bible, we must ask a prior question: what do we mean when we say a book is "canonical"? The answer is less obvious than it appears. The word "canon" is used in multiple ways — sometimes referring to a list of books, sometimes to the authority those books possess, and sometimes to the process by which that authority was recognized. These different meanings produce very different accounts of how we got our Bible, and confusion between them lies at the root of many popular misunderstandings about the formation of Scripture.

This opening lesson lays the groundwork for the entire course by examining what "canon" means, how the concept has been understood across the history of the church, and why the model you adopt at the outset will determine the conclusions you reach about virtually every subsequent question. Whether you believe the church created the canon or recognized it — whether you think canonical authority is something the community bestows or something the text possesses — depends on commitments you bring to the question before you examine a single piece of historical evidence.

The Word "Canon"

The English word "canon" derives from the Greek kanōn (κανών), which originally meant a "reed" or "measuring rod" — a straight stick used by craftsmen to ensure their work was true. By extension, kanōn came to mean a "rule," "standard," or "norm" — something against which other things are measured. In classical Greek, the word was used for the rules of grammar, the standards of art, and the norms of ethical conduct.

When applied to Scripture, "canon" carries this sense of a standard or rule. The canonical books are the books that serve as the authoritative standard for Christian faith and practice. They are the measuring rod against which all doctrine, all teaching, and all claims to divine truth are evaluated. This is the sense in which Paul uses a related term when he writes of walking "by this rule" (kanoni) in Galatians 6:16 and Philippians 3:16.

Canon as List vs. Canon as Authority

One of the most common confusions in popular discussions of the canon is the conflation of two distinct questions: When did the church compile a definitive list of biblical books? and When did these books begin to function as authoritative Scripture? These are not the same question, and conflating them produces serious historical distortions.

Canon as List

If "canon" means primarily a formal list of books ratified by an official ecclesiastical body, then the canon of the New Testament was not established until relatively late. The first known list that matches the current 27-book New Testament canon exactly is found in Athanasius' 39th Festal Letter of AD 367. The regional councils of Hippo (393) and Carthage (397) subsequently affirmed this same list. On this understanding, the "canon" did not exist before the late fourth century.

This is the account that popular critics often present. "The canon wasn't established until the fourth century" is a claim you will encounter repeatedly in skeptical literature, social media, and introductory religious studies courses. And in a narrow, technical sense, it is true — if "canon" means exclusively an official, church-ratified list. But this framing is profoundly misleading, because it implies that the books of the New Testament had no recognized authority before an institutional body declared them authoritative.

Canon as Functional Authority

If "canon" means the functional authority of certain books within the life of the church — their use in worship, their citation as Scripture, their role as the standard for doctrine and practice — then the canon existed much earlier than any formal list. Paul's letters were being collected and circulated as authoritative documents within decades of their composition. The four Gospels were widely recognized as uniquely authoritative by the mid-second century at the latest. The core of the New Testament canon was functionally established long before any council met to ratify it.

This passage is remarkable. The author of 2 Peter refers to Paul's letters as a known collection ("all his letters"), treats them as authoritative ("the wisdom given him"), and places them alongside "the other Scriptures" — a phrase that equates Paul's writings with the Old Testament. Whether one dates 2 Peter early (as traditional scholarship holds) or late (as critical scholarship argues), this text demonstrates that Paul's letters were being treated as Scripture within the first or early second century — long before any council "canonized" them.

Three Models of Canon

The theologian Michael Kruger, in his important work Canon Revisited, identifies three broad models for understanding the canon that correspond to different theological and philosophical commitments. Every scholar who writes about the canon operates — consciously or unconsciously — within one of these frameworks.

The Community-Determined Model

The community-determined model holds that the canon is fundamentally a product of the Christian community. The books of the Bible have no inherent authority apart from the community that selected them. Authority flows from the community to the books, not from the books to the community. On this view, the canon could have looked different — different books could have been included or excluded — and the decision was ultimately a human one, shaped by the theological preferences, political dynamics, and institutional interests of the communities that made it.

This model is popular in contemporary scholarship and in the broader culture. It underlies claims that the canon was "decided by committee," that the process was driven by institutional power rather than divine guidance, and that the "losing" books were suppressed for political rather than theological reasons. In its most sophisticated form, this model draws on sociological and postmodern theory to argue that all canons — literary, religious, cultural — are constructions of the communities that produce them, reflecting those communities' values and power structures rather than any objective standard of truth.

The Historically-Determined Model

The historically-determined model attempts to identify the canon through objective historical criteria — apostolic authorship, date of composition, theological consistency, and widespread usage in the early church. On this view, we can determine which books belong in the canon by examining the historical evidence and applying rigorous criteria. If a book was written by an apostle, used widely in the early churches, and taught sound doctrine, it belongs in the canon.

This model is common among evangelical scholars and apologists, and it has real strengths — it takes historical evidence seriously and provides concrete criteria for evaluation. But Kruger identifies a subtle problem: if canonical authority depends entirely on our ability to verify historical criteria, then the canon's authority ultimately rests on the conclusions of historical scholarship rather than on God's self-authenticating word. If a new manuscript discovery overturned our dating of a particular book, would it cease to be canonical? The historically-determined model makes the canon dependent on the ever-shifting conclusions of historical research.

The Self-Authenticating Model

The self-authenticating model, which Kruger advocates and which stands within the Reformed theological tradition, holds that the canonical books possess an inherent authority — an authority that derives from God as their ultimate author — and that this authority is recognized by the church through the internal testimony of the Holy Spirit. On this view, the books of the Bible are not authoritative because the church chose them or because historians verified them; they are authoritative because God inspired them, and the church recognized that inspiration through the Spirit's work.

The self-authenticating model does not reject historical evidence — it welcomes it as confirmation of what the Spirit has testified. But it insists that the ultimate ground of canonical authority is divine rather than human. The Westminster Confession of Faith captures this when it states that "our full persuasion and assurance of the infallible truth and divine authority" of Scripture depends "upon the inward work of the Holy Spirit, bearing witness by and with the Word in our hearts" (WCF 1.5). Historical evidence, ecclesiastical tradition, and rational argument all play a role — but the final ground of confidence is the Spirit's testimony.

Why Your Starting Point Matters

The model you adopt for understanding the canon is not a minor technical decision. It determines the answers you will give to virtually every question in this course. If you begin with the community-determined model, you will read the history of the canon as a story of human decisions, institutional politics, and contingent outcomes. If you begin with the self-authenticating model, you will read the same history as the story of God's providential preservation of his word through the agency of his people.

The same historical evidence is available to both frameworks. The question is not whether there is evidence but what kind of story the evidence tells. A scholar who assumes from the outset that divine action is not a permissible historical explanation will inevitably arrive at a purely naturalistic account of canon formation. A scholar who assumes that God acts in history — including through the ordinary processes of writing, copying, collecting, and recognizing texts — will see the same evidence as consistent with divine oversight.

This is not a weakness of the discussion; it is its most important feature. The study of the canon is not a neutral, presupposition-free exercise. It is a discipline in which your deepest convictions about God, history, and human knowledge are brought to the surface and put to the test. This course will equip you to engage the evidence rigorously, to understand the competing models honestly, and to articulate a defense of the Reformed position with both conviction and humility.

Conclusion

The word "canon" is deceptively simple. Behind it lies a web of assumptions about authority, community, history, and divine action that must be untangled before any meaningful discussion of the Bible's formation can take place. Is the canon a list imposed by the church, a collection verified by historians, or a self-authenticating word recognized by the Spirit? The answer you give to this question will shape everything that follows.

As we move through this course, we will examine the historical evidence in detail — the manuscripts, the councils, the controversies, the critics. But we begin here, with the foundational conviction that animates the Reformed tradition: the Bible is not the church's book in the sense that the church created it. It is God's book, given to the church, recognized by the church, and treasured by the church — but possessing an authority that no human institution granted and no human institution can revoke.