From Russell M. Nelson:
And after having received the record of the Nephites, yea, even my servant Joseph Smith Jr., might have power to translate through the mercy of God, by the power of God, the Book of Mormon. . . Doctrine and Covenants 1:29
Through the Prophet Joseph Smith we have received. . . The Book of Mormon, which is another Testament of Jesus Christ. It contains the fullness of the gospel of Jesus Christ, meaning it contains more information about the life, the mission and the ministry of Jesus Christ than does any other book. From revelations given through the Prophet Joseph Smith we know that the gospel did not originate in the meridian of time. It is everlasting. It was taught by Adam. . . .And it will be taught in that same purity by future prophets who will stand at the head of this Church. (The Church of Jesus Christ of latter-day Saints) ~~Russell M. Nelson, Prophet, Seer, and Revelator and President of the Church of Jesus Christ of Latter-day Saints Daily Joy (Salt Lake City: Deseret Book, 2020), p.387