On mysteries that are not yet fully known and so it is unwise to talk about them, see commentary at 1 Nephi 10:15–22; 2 Nephi 28:30; and especially Alma 12:9.
On things being preserved for “a wise purpose” known by God, see commentary at Words of Mormon 1:7.
On God’s course being “one eternal round,” see commentary at 1 Nephi 19:22–24, under “Why Study Isaiah,” 3 Nephi 23:1–3; and commentary at Alma 7:20–21.
On the strictness of the commandments of God, see commentary at Alma 57.