The Canon of Scripture (Why Catholic Bibles Have 73 Books)

Start with the shared ground: no verse of Scripture lists its own table of contents. The 27-book New Testament list was fixed by Church councils, such as Hippo (393) and Carthage (397), not by a Bible verse. Those same councils listed the same 46 Old Testament books. A person who trusts the 397 council on Hebrews and Revelation but rejects it on Tobit and Wisdom needs a reason for picking and choosing.

On the Jewish canon: in Jesus's day the boundaries were not as settled as the objection assumes. Scholars now doubt the old theory that a "Council of Jamnia" closed the Hebrew canon around 90 AD. Meanwhile, the Greek Septuagint, which included these books, was the Bible of most Greek-speaking Jews, and the New Testament writers quote from it far more often than from the Hebrew text. Fragments of Sirach and Tobit were also found among the Dead Sea Scrolls, so they circulated in Palestine too.

On "never quoted": the New Testament never quotes Esther, Ezra, Nehemiah, Ecclesiastes or the Song of Songs either, and Jude 14 quotes the non-canonical 1 Enoch. Being quoted is not the test for canon. There are New Testament echoes of the deuterocanon, such as Hebrews 11:35 pointing back to the martyrs in 2 Maccabees 7, but the stronger argument is Church authority, not proof-text counting.

Be honest about Church history: some Fathers, including Jerome and Athanasius, had reservations or placed these books in a lesser category. Athanasius's Easter letter of 367 lists 22 Old Testament books in the Hebrew count (with Baruch and the Epistle of Jeremiah attached to Jeremiah) and our 27 New Testament books, then names Wisdom, Sirach, Esther, Judith and Tobit as "not included in the Canon" but appointed to be read by new converts. That is why the question stayed discussed until the Council of Trent (1546) defined the list for Catholics. Luther himself dropped the deuterocanon in 1534 and also questioned James, Hebrews, Jude and Revelation. The disagreement is less about evidence than about who has authority to settle the list.

On the doctrine charge: 2 Maccabees 12:43-46 does support prayer for the dead, but Catholic teaching on Purgatory also rests on 1 Corinthians 3:15 and the early Church's practice. The books were not added to create the doctrine; the Church kept the books it had always used.

On "those were only local councils": that is true, and worth admitting. Hippo (393) and Carthage (397) were regional North African councils, and no council for the whole Church defined the Old Testament list until Trent (1546). But the same regional-council process gave the New Testament list that Protestants accept, and the West was not alone: around 405 Pope Innocent I sent the bishop of Toulouse a list of Scripture that includes the deuterocanonical books. A list from a council for the whole Church also came before the Reformation: the Council of Florence's decree for the Copts (Session 11, 1442) names all 46 Old Testament books, including Tobit, Judith, Wisdom, Sirach, Baruch and 1-2 Maccabees. Be careful with it, though. It was addressed to the Copts, not written as a canon definition for everyone, and the Greek Orthodox union was a separate decree in 1439. Trent (1546) was the first solemn definition. The point is not that these councils were infallible by themselves. It is that Protestants already rely on the Church's early judgment for the 27 New Testament books, so the question is why that reliance stops at the Old Testament.

On Protestant history: the Westminster Confession (1.3) says "The books commonly called Apocrypha, not being of divine inspiration, are no part of the canon of the Scripture." Yet the 1611 King James Bible printed those books between the Testaments, and the British and Foreign Bible Society only stopped funding Bibles that included them in 1826-27. So a Bible of exactly 66 books is a newer standard practice than many people assume. Say this gently: it explains why the Catholic Bible looks "extra" to Protestants without suggesting they have been misled.

Ask one sincere question: "How do you decide which books belong in the Bible?" Reformed Christians have a serious answer: the inward testimony of the Holy Spirit and the self-authenticating character of Scripture (Westminster Confession 1.5), together with the historical record. Listen to it fully. The Catholic side has its own question to answer, which is why trust the Church's authority (see Lesson 1), so use this question to find the real disagreement and not to end the conversation.