Since the Catholic Church holds that the Bible is not sufficient in itself, it naturally teaches that the Bible needs an interpreter. The reason the Catholic Church so teaches is twofold: first, because Christ established a living Church to teach with His authority. He did not simply give His disciples a Bible, whole and entire, and tell them to go out and make copies of it for mass distribution and allow people to come to whatever interpretation they may. Second, the Bible itself states that it needs an interpreter.

