Mystery contained

1. Mosiah 8: 19
     19 And now, when Ammon had made an end of speaking these words the king rejoiced exceedingly, and gave thanks to God, saying: Doubtless a great mystery is contained within these plates, and these interpreters were doubtless prepared for the purpose of unfolding all such mysteries to the children of men.
2. Alma 37: 4
     4 Behold, it has been prophesied by our fathers, that they should be kept and handed down from one generation to another, and be kept and preserved by the hand of the Lord until they should go forth unto every nation, kindred, tongue, and people, that they shall know of the mysteries contained thereon.