Elder Bruce R. McConkie wrote, "There are approved and inspired writings that are not in the standard works. These writings also are true and should be used along with the scriptures themselves in learning and teaching the gospel." This classic collection of doctrinal essentials includes "The King Follett Discourse, " "The Sermon in the Grove, " "The Wentworth Letter, " "The Father and the Son, " "The Origin of Man, " "The Lectures on Faith, " "Man's Destiny, " and "Invocation, or the Eternal Father and Mother.