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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 it began before the deaths of the original 12 apostles, thus the need for a ‘restored church’.