http://www.lightplanet.com/mormons/basic/gospel/fullness_eom.htm
Christ himself declared the fulness of his gospel: "For I came down from heaven, not to do mine own will, but the will of him that sent me. And this is the Father's will…, that every one which seeth the Son, and believeth on him, may have everlasting life; and I will raise him up at the last day" (John 6:38-40).
Latter-day Saints believe that every prophet, from whatever dispensation, prophesied of Christ. But the phrase fulness of the gospel implies that periods have occurred when the gospel was not on the earth in its fulness, either in doctrine or in ordinance. The Book of Mormon was described by a heavenly messenger to Joseph Smith in 1820 as "giving an account of the former inhabitants of this continent," and "the fulness of the everlasting Gospel was contained in it, as delivered by the Savior" (JS—H 1:34).
President Ezra Taft Benson explains: "The Book of Mormon contains the fulness of the gospel of Jesus Christ (D&C 20:9). That does not mean it contains every teaching, every doctrine ever revealed. Rather, it means that in the Book of Mormon we will find the fulness of those doctrines required for our salvation. And they are taught plainly and simply so that even children can learn the ways of salvation and exaltation" (Benson, pp. 18-19).
Nephi, a Book of Mormon prophet living centuries before the coming of Christ, indicated that the fulness of the gospel would not always be on the earth. In a vision of the Lord's future ministry, he saw that parts of the gospel would be altered and tampered with. Nephi wrote, speaking of the Bible, "When it proceeded forth from the mouth of a Jew it contained the fulness of the gospel of the Lord, of whom the Twelve apostles bear record." But men have taken away from the Bible "many parts which are plain and most precious; and also many covenants of the Lord have they taken away," which resulted in a loss of the gospel (cf. 1 Ne. 13:24-29).
So basically, what it boils down to is this the fulness of those doctrines required for our salvation.
I also believe that the Bible has the fulness of the gospel in it, but do you believe it?
What is your definition for "fulness of the gospel?"
There is no addition you can add to Christ's work for your salvation. Whenever you see a 'fullness of doctrine necessary for your salvation', you can be sure you're learning the deceits of men, sent to your consciousness from the father of lies, because what Jesus did on the Cross is all there is and the individual 'faithing' in His work is all that is required for salvation. As the saying goes--which seems to iritate Resty no end--everything else is as filthy rags in God's sight because it detracts from the Glory of His suffering for you.
Sorry; but there is not ONE reference here from the BoM - which supposedly contains it...
If it's so PLAIN; why can't Chapter and verse be POSTED?