These words remind us of Moroni “that God is the same yesterday, today, and forever” (Mormon 9:9; see also Moroni 10:19). Paul the Apostle had apparently read the same passage, which is no longer in the Old Testament (see Hebrews 13:8). Alma refers to God’s work yesterday with his fathers (Alma 29:11 above), and with Abraham, Isaac, and Jacob (vv. 12–13). The God to whom Alma referred is Jesus Christ (see 1 Nephi 19:19). Alma then referred to his day of success, but more so of the success of his brethren, the sons of Mosiah and their companions (vv. 14–16). His last wish, for his brethren to “sit down in the kingdom of God” (v. 17), reflects that Jesus Christ is the same forever. It is Jesus’ kingdom. Modern revelation testifies of Jesus Christ being “the same God yesterday, today, and forever” (D&C 20:12). The Book of Mormon testifies of this concept in the subtitle: “Another Testament of Jesus Christ.”
Alma also bears witness of the joy of missionary work (Alma 29:14–16), the title of this chapter of this work. As stated previously, only those who have experienced this joy will understand and appreciate that of which Alma and Ammon have spoken. This joy comes at varying degrees at various times, but it comes.