Ether 4:4-6; 3 Ne. 26:9-10; Doctrines of Salvation, Smith, 3:224-225; Millennial Messiah, McConkie, pp. 114, 149-150; History of the Church, Smith, 4:537
“Now the Lord has placed us on probation as members of the Church. He has given us the Book of Mormon, which is the lesser part, to build up our faith through our obedience to the counsels which it contains, and when we ourselves, members of the Church, are willing to keep the commandments as they have been given to us and show our faith as the Nephites did for a short period of time, then the Lord is ready to bring forth the other record and give it to us, but we are not ready to receive it. Why? Because we have not lived up to the requirements in this probationary state in the reading of the record which had been given to us and in following its counsels.” (Joseph Fielding Smith, Conference Report, Oct. 1961, pp. 19-20)
“When, during the Millennium, the sealed portion of the Book of Mormon is translated, it will give an account of life in the premortal existence; of the creation of all things; of the fall and the Atonement and the Second Coming; of temple ordinances, in their fulness; of the ministry and mission of translated beings; of life in the spirit world, in both paradise and hell; of the kingdoms of glory to be inhabited by resurrected beings; and many such like things.” (Bruce R. McConkie, CES Symposium, Aug. 1984, p. 1)