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The Bible

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Catholic AnswerActually, the ultimate authority on Christian doctrine is considered God, who, by His Son, Jesus Christ, and the Holy Spirit, appointed St. Peter to head His Church. Thus the Church is the ultimate authority on Catholic practice and doctrine. From the Church, very early on, the New Testament was written, and was approved by the Church near the end of the fourth century. Our Blessed Lord, Jesus Christ, guaranteed Peter (and his successors, the Popes), but did NOT guarantee the Bible. The Church is the only guarantee of the Bible.
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Q: What book is consider the ultimate authority on Catholic practice doctrine?
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