How the Canon Was Formed
The historical process by which the Church received the twenty-seven books of the New Testament as Scripture.
The canon was not decided at a single council. It emerged over three centuries as the Church discerned which writings the apostles had left behind, which were universally used in worship, which taught the received faith, and which bore the marks of divine authorship. By the mid-2nd century the four Gospels and Paul's epistles were already a fixed core; the disputed edges — Hebrews, James, 2 Peter, 2–3 John, Jude, Revelation — took another two hundred years to settle.
The Four Criteria
1. Apostolic Origin
Written by an apostle, or by a close associate of an apostle. Mark is received because he is Peter's companion; Luke is received because he is Paul's.
2. Universal Use
Received and used liturgically across the churches of the Roman world. Local writings never gained canonical status even when orthodox.
3. Orthodoxy
Consistent with the received rule of faith. The Gnostic gospels were excluded because they taught dualism, denied the goodness of creation, or denied the bodily resurrection.
4. Self-Authentication
Bearing the marks of divine speech — the internal witness that the reader recognizes God is speaking. Augustine and Calvin both stress this criterion; it is not merely historical but pneumatological.
Key Milestones
- c. AD 100 — Clement of Rome quotes Paul, Hebrews, and the synoptic tradition as authoritative.
- c. AD 140 — Marcion proposes a canon of Luke and ten Paulines. The Church rejects it — but the challenge accelerates canonical consolidation.
- c. AD 170 — Muratorian Fragment: earliest surviving canonical list. Includes four Gospels, Acts, thirteen Paulines, Jude, 1 & 2 John, Revelation.
- c. AD 200 — Irenaeus argues for four Gospels — no more, no less — from the "four corners of the earth."
- AD 367 — Athanasius's Festal Letter: the earliest surviving list of exactly the 27 books of the NT canon we now receive.
- AD 397 — Council of Carthage ratifies the 27-book NT canon in the West.
- 16th century — Reformation raises questions about the deuterocanonical books (kept by Catholic and Orthodox, moved to an appendix by Luther and later removed by most Protestants).