[Moroni] said there was a book deposited, written upon gold plates, giving an account of the former inhabitants of this continent, and the source from whence they sprang. He also said that the fulness of the everlasting Gospel was contained in it, as delivered by the Savior to the ancient inhabitants; - Joseph Smith - History 1:34
"[Moroni's] coming opened a new dispensation of the gospel of Christ, direct from God," said Elder Mark E. Petersen of the Council of the Twelve at October 1983 general conference. "It had no relationship to any other religious movement. It was a new and divine episode, a modern revelation from the heavens, a fresh effort on the part of the Almighty to introduce today's nations to the gospel of His Beloved Son."There is only one gospel of Christ. That angel, flying in midheaven, possessed it, and brought it back to earth as a divine restoration of divine truths. And we repeat - that angel was Moroni."