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Stand, therefore, having your loins girt about with truth,) He said the word loins means our sexual capabilities. They must be protected by girting them with truth.
Then he quoted Moses 7:62 (And righteousness will I send down out of heaven; and truth will I send forth out of the earth) The truth that has come out of the earth is the Book of Mormon. Therefore if we read daily from the Book of Mormon, we can protect our loins from temptation.
From my own experience as a youth and as an adult, I know this is true.