The Living Tradition An Orthodox Archive of the Church Fathers and Early Church

Reading the Fathers with the Church — lesson 4

Guided reading: Irenaeus on the rule of faith

A single chapter, read closely, with the archive open beside you.

  • Historical consensusBroadly agreed among historians working from the surviving evidence. Consensus can shift when the evidence or the method changes.
  • Received Orthodox teachingTaught consistently and received throughout the Orthodox Church, though not necessarily formulated in a conciliar definition. This is not a claim that no Father ever wrote differently.

Primary evidence verified Content last reviewed 2026-08-29

What still needs checking (1)
  • Add a second guided reading from a different genre — a homily or a canonical letter.

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What this lesson covers

  • Read Against Heresies I.10 with attention to its argument.
  • Notice what Irenaeus claims and what he does not.
  • Practise the four questions on a real text.

About 8 minutes to read.

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This lesson asks you to read one chapter: Book I, chapter X of Against Heresies, archived here in full. It is short. Read it before continuing.

What Irenaeus is doing

The chapter states the faith the Church has received — one God the Father, one Christ Jesus who became incarnate, the Holy Spirit who spoke through the prophets, the dispensations, the coming judgement — and then argues that this faith is held identically everywhere.

His list of places is worth noticing: Germany, Spain, Gaul, the East, Egypt, Libya, the central regions. He is not claiming that every church uses the same words. He is claiming that the import of the tradition is one and the same, and he says so explicitly.

Apply the four questions

  1. Genre. This is polemical theology, written to refute specific teachers. It is not a creed, and Irenaeus is not issuing one.
  2. Edition. The Ante-Nicene Fathers translation of 1885, from a Latin text that itself translates a lost Greek original. That double remove matters for close verbal arguments.
  3. Attribution. Securely Irenaeus.
  4. Reception. This argument was received: the shape of it recurs in Tertullian, in the creeds, and in the Church's understanding of tradition.

Now read chapter X again. The second reading is where the lesson is.

Key Scripture

  • Jude 3 — The faith once delivered to the saints.
  • 1 Corinthians 15:3-5 — What Paul received and delivered — a rule of faith in the apostolic period.

On Scripture references. References are given so you can read the passage in the translation your parish uses. This site does not reproduce a modern copyrighted Bible text.

Patristic and liturgical witnesses

For, although the languages of the world are dissimilar, yet the import of the tradition is one and the same.

Against Heresies, Book I, Book I, Chapter X.2 Ante-Nicene Fathers, Vol. I, trans. Alexander Roberts and William Rambaut — public domain Read this work in the archive

Why this matters in lived Orthodoxy

This chapter is the reason an Orthodox Christian can say that the faith is the same in a Greek parish, a Slavonic one and an English-speaking one. Irenaeus made the argument in the second century and it has not needed replacing.

Review

What does Irenaeus claim is the same everywhere?
The import of the tradition — the faith itself — not identical wording, since he says the languages differ.
What complicates close verbal arguments from this text?
The English translation is made from a Latin version that itself translates a lost Greek original.

Your notes

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Going deeper

Sources for this page

  1. Tier C The Apostolic Fathers with Justin Martyr and Irenaeus Alexander Roberts and James Donaldson (eds.); A. Cleveland Coxe (American ed.) Irenaeus, Against Heresies, Book I, Chapter X translated edition of primary texts Source record

Tiers are explained in the methodology. No page on this site has been reviewed or approved by any bishop, priest, synod or seminary.