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We know we can trust and believe Him for all eternity because His word is infallible. If we can’t even believe these words of His, how could we possibly believe in the resurrection?
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The Fourth book of Nephi tells of the beginning stages of a ‘great apostasy’ from the true church and the real Christ. Mormons believe that it actually began even before the death of the original 12 apostles, thus the need for a ‘restored church’.