One example from ancient times of the Catholic Church officially deciding which books belong in the Bible, I'll quote the second part of the DECREE of Pope Damasus I (r. 366-384). The document was a decree of the Council of Rome which met under Damasus' presidency in AD 382.Genuinely alert readers should note that Jurgens is somewhat famous for passing along forged and fake documents like this one as if they were real. The document he cited, as from "Pope Damasus," is also known as the Decree of Gelasius, but it's not written by him, either, but was probably composed by an anonymous source in the sixth century.
The text of the DECREE as re the Scriptures was copied from page 406 of Volume 1 of THE FAITH OF THE EARLY FATHERS, edited/translated by William A. Jurgens (Collegevlle, The Liturgical Press: 1970).
" It is likewise decreed: Now, indeed, we must treat of the divine Scriptures: what the universal Catholic Church accepts and what she must shun. The list of the Old Testament begins: Genesis, one book; Exodus, one book; Leviticus, one book; Numbers, one book; Deuteronomy, one book; Jesus Nave [Joshua], one book; of Judges, one book; Ruth, one book; of Kings, four books; Paralipomenon, two books; One Hundred and Fifty Psalms, one book; of Solomon, three books: Proverbs, one book; Ecclesiastes, one book; Canticle of Canticles; one book; likewise, Wisdom, one book; Ecclesiasticus [Sirach], one book. Likewise, the list of the Prophets: Isaias, one book; Jeremias [Baruch was often considered part of Jeremiah], one book, along with Cinoth, that is, his Lamentations; Ezechiel, one book; Daniel, one book; Osee, one book; Amos, one book; Micheas, one book; Joel, one book; Abdias, one book; Jonas, one book; Nahum, one book; Habacuc, one book; Sophonias, one book; Aggeus, one book; Zacharias, one book; Malachias, one book. Likewise, the list of histories: Job, one book; Tobias, one book; Esdras, two books; Esther, one book; Judith, one book; of Maccabees, two books.
"Likewise, the list of the Scriptures of the New and Eternal Testament, which the holy and Catholic Church receives: of the Gospels, one book according to Matthew, one book according to Mark, one book according to Luke, one book according to John. The Epistles of the Apostle Paul, fourteen in number: one to the Romans, two to the Corinthians, one to the Ephesians, two to the Thessalonians, one to the Galatians, one to the Philippians, one to the Colossians, two to Timothy, one to Titus, one to Philemon, one to the Hebrews. Likewise, one book of the Apocalypse of John. And the Acts of the Apostles, one book. Likewise, the canonical Epistles, seven in number: of the Apostle Peter, two Epistles; of the Apostle James, one Epistle; of the Apostle John, one Epistle; of the other John, a Presbyter, two Epistles; of the Apostle Jude the Zealot, one Epistle. Thus concludes the canon of the New Testament."
Alert readers should note how this list includes as fully canonical the Deuterocanonical books which the founders of Protestantism erroneously purged from their editions of the Bible after 1517.
In truth, "the Roman Catholic Faith" was shaped by very many incidents such as this, in which a false or forged document is believed as genuine. I've already written about "Pseudo-Dionysius," a neoplatonist writer who purported to be the convert of Paul from Acts 17. Nevertheless, the great Thomas Aquinas thought that he, and other fake sources, was genuine, and Aquinas has a somewhat foundational place in Roman Catholic theology and doctrine today. Much of what is now Marian dogma also had its roots in forged or spurious documents.
So we have the spectacle of Roman Catholic apologists running around telling us how difficult God's own Scriptures are, in the name of having a "living Authority" that passes along spurious documents as foundational for its faith. It truly is a sad situation.