Whatever a person thinks about the Book of Mormon; whatever a person thinks about Joseph Smith, Jr., who produced it; whatever a person thinks about the Church of Jesus Christ of Latter-day Saints, who reveres it as scripture, there’s one thing we all have to admit as a fact: the Book of Mormon exists. So there are only two possibilities: either Joseph Smith, Jr. translated the Book of Mormon from metal plates and it is an ancient record of God’s dealings with His children in the Western Hemisphere, or it came about some other way and is not true. It’s a question worth answering, and the Book of Mormon itself tells us how to find the answer to the question. This chapter teaches that, first, we must remember how merciful God has been to mankind “and ponder it in [our] hearts” (v. 3). Then we must “ask God, the Eternal Father, in the name of Christ, if these things are not true” (v. 4). An all-knowing God who is merciful would not only know the answer to the question, but would share that answer with anyone who seeks it. But Moroni tells us we must “ask with a sincere heart, with real intent, having faith in Christ” (v. 4). The promise for asking in this way is that God “will manifest the truth of it unto you by the power of the Holy Ghost” (v. 4).
The take away is this: once you know from the Holy Ghost the truth about the Book of Mormon, you’ll know how God uses the Holy Ghost to communicate truth to you, personally, for He will testify of the Book of Mormon in a way that you’ll be able to understand. And once you know exactly how God uses the Holy Ghost to communicate truth to you, personally, you “may know the truth of all things” (v. 5).