In section 120 of the Catechism, we are told just what the books of the Bible are. While it does not expressly explain why those are the books, it is clear from history and the inner testimony of these books that there was a gradual development of how each book and it's portions came to be scriptural.

To learn more, give us a listen. If you like what you hear, help support this podcast by purchasing my book "A Stations of the Cross Devotional" at https://amzn.to/2C66qr6