This passage has reference to the prophecy of Isaiah found in Isa 52:7, How beautiful upon the mountains are the feet of him that bringeth good tidings, that publisheth peace. Nephi was referring to those who would bring forth the kingdom of God in the latter days. Few would doubt that men like Joseph Smith, Brigham Young, Hyrum Smith, Parley P. Pratt, Willard Richards, John Taylor, Oliver Cowdery, and a hundred others were foreordained to the great work of the Restoration. Sometimes, we underestimate the importance of an event because of our proximity to it. The Restoration of priesthood keys, saving ordinances, and temple worship is the key to saving the entire earth from destruction. This destruction would come with the Second Coming of the Lord. Joseph Smith was told what would happen without the Restoration, If it were not so, the whole earth would be utterly wasted at his coming (JS-H 1:39).