Gems from the Book of Mormon

What significant Christian doctrines does the Book of Mormon teach? Gems from the past light a path to the future in Christ the Lord. For example: The Gospel plan is to save families, God judges us for our use of agency but intervenes against the wicked, the atonement is infinite, the priesthood are "chosen vessels," and we must "take upon ourselves the name of Christ" at baptism. One great GEM is the witness of the Book of Mormon to the THREE DAYS and NIGHTS Jesus was in the tomb, confirmed in the Bible by the double Sabbaths (plural in Matt. 28:1). Also the prophesy found in Isaiah pertaining to Joseph Smith is clarified in the LXX. These are just a few of the GEMS found in the Book of Mormon!