These verses promise us that the testimonies of differing nations will agree. They will all testify both of Jesus Christ as Redeemer and Savior, and provide the means by which we can come to Him and be saved.
The numerous examples of the Book of Mormon all converge on knowing Christ. Indeed, the text has more examples of Christ ministering through the veil to mortal men than any other record, including His Judean ministry. It is a veritable treasure of Second Comforter experiences. If you want to know Christ, the Book of Mormon is your best guide.