Class date: 01/21/18
In the OT, when God established His covenant with Israel, he also established a living, continuing authority in the Mosaic priesthood. This authority did not end when the OT was written down, but rather continued to safeguard and interpret the Sacred Scriptures.
Similarly, when Christ established His Church, what St. Paul calls the "New Israel," He established a living authority to continue to teach, govern, and sanctify in His name. This Church is called Apostolic because it began with the 12 Apostles and continues with their successors. Its purpose is to preserve and authentically interpret the Revelation of Jesus Christ, maintaining it in its fullness and purity until the end of time. This same authority determined the canon of Scripture.