President Joseph Fielding Smith (1876–1972) taught that children who will be raised during the Millennium “shall grow up ‘as calves of the stall’ unto righteousness, that is, without sin or the temptations which are so prevalent today” (The Way to Perfection [1970], 299).
Contemplate the difference between a calf that is raised out on the range or in the mountains and one that is raised in a barn. The calf on the range is subject to all the forces of nature: inclement weather, predatory animals, and occasional scarcity of food and water. On the other hand, the calf raised in the barn or in a stall is protected from poor weather and predatory animals. Likewise, food and water are regularly provided. Nephi taught that “the time cometh speedily that the righteous must be led up as calves of the stall” (1 Nephi 22:24).
One commentator said: “Those who are left after the judgment of the Second Coming will be able to raise up their children as calves are raised in a stall. The calf is protected from the elements, and his environment is controlled (Malachi 4:2; 1 Nephi 22:24). The children in the Millennium will similarly ‘grow up without sin unto salvation’ (D&C 45:58). The telestial element will be removed, and with Satan being bound (Revelation 20:1–3; 1 Nephi 22:26; D&C 101:28), the environment will be more controlled” (Monte S. Nyman and Farres H. Nyman, The Words of the Twelve Prophets: Messages to the Latter-day Saints [1990], 145).