D&C 115:5-6
“In the last days the Lord ‘will lift up an ensign to the nations from far.’ Those who gather to this ensign will come quickly and with power. They will do so amidst contrasting conditions of light and darkness or good and evil. A secondary interpretation of these verses focuses on the Assyrian invasion of Israel in 722-721 B.C. Commentators who subscribe to this belief identify the speed with which the Assyrian soldiers invaded the land and the quick destruction they brought about. Nevertheless, the major focus of these verses appears to align itself more closely with events of the last days.” (Hoyt W. Brewster, Jr., Isaiah Plain and Simple, p. 51)
“This Church is the standard which Isaiah said the Lord would set up for the people in the latter days… . This Church is the ensign on the mountain spoken of by the Old Testament prophets.” (Marion G. Romney, Conference Report, Apr. 1961, p. 119)
“We see that an ensign in the last days can refer to Zion, the gospel, missionary work, the gathering, and the Book of Mormon… . In short, the term ensign encompasses the Lord’s whole work, and all aspects of his Church serve as his ‘standard’ to the world.” (Victor Ludlow, Isaiah: Prophet, Seer, and Poet, pp. 122-123)