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For Catholics, all the canonical books of the Bible (including the Deuterocanonical books), the tradition of the Church and the interpretation of these by the Magisterium (which may be outlined in a catechism, a compendium or a declaration) constitute the complete and best resource for fully attaining to God's revelation to mankind. Catholics believe that sacred scripture and sacred tradition preserved and interpreted by the Magisterium are both necessary for attaining to the fullest understanding of all of God's revelation.