"When First the Glorious Light of Truth"
Of President Brigham Young's favorite hymn, "When First the Glorious Light of Truth," President Heber J. Grant said the following during the October 1919 general conference:
"President Lyman said that President Brigham Young's [favorite hymn] was, 'Oh, ye mountains high;' but I have since been told by one of his daughters that this is a mistake, that his favorite was Brother William Clayton's hymn, 'When first the glorious light of truth, burst forth in this last age, How few there were with heart and soul, to obey it did engage.'"
This hymn, which bore no name in the hymnal, was known by its first line (as President Grant recalls above). It was kept in the Church hymnal until 1985 when a new hymnal was published with a revised list of songs.