This "fulness of the Gospel" was that revealed in _The Book of Mormon_, of the discovery of which and its contents he says:--"On the evening of the 21st of September, A.D. 1823, while I was praying unto God and endeavouring to exercise faith in the precious promises of Scripture, on a sudden, a light like that of day, only of a far purer and more glorious appearance and brightness, burst into the room; indeed, the first sight was as though the house was filled with consuming fire. The appearance produced a shock that affected the whole body. In a moment, a personage stood before me surrounded with a glory yet greater than that with which I was already surrounded. The messenger proclaimed himself to be an angel of God, sent to bring the joyful tidings, that the covenant which God made with ancient Israel was at hand to be fulfilled; that the preparatory work for the second coming of the Messiah was speedily to commence; that the time was at hand for the Gospel in all its fulness to be preached in power unto all nations, that a people might be prepared for the Millenial reign.
"I was informed also concerning the aboriginal inhabitants of this country (America), and shown who they were and from whence they came; a brief sketch of their origin, progress, civilisation, laws, governments, of their righteousness and iniquity, and the blessings of God being finally withdrawn from them as a people, was made known unto me. I was also told where there were deposited some plates, on which was engraven an abridgment of the records of the ancient prophets that had existed on this continent. The angel appeared to me three times the same night, and unfolded the same things. After having received many visits from the angels of God, unfolding the majesty and glory of the events that should transpire in the last days, on the morning of the 22nd of September, 1827, the angel of the Lord delivered the records into my hands.
"These records were engraven on plates which had the appearance of gold; each plate was six inches wide and eight inches long, and not quite so thick as common tin. They were filled with engravings in Egyptian characters, and bound together in a volume, as the leaves of a book, with three rings running throughout the whole: it was partly sealed. With the records was found a curious instrument, which the ancients called _Urim and Thummim_, which consisted of two transparent stones set in the rim on a bow fastened to a breastplate. Through the medium of the _Urim and Thummim_ I translated the record by the gift and power of God.