Throughout Gabe's life, and especially since he received his mission call, I've had powerful feelings that Gabe has an important role to play in fulfilling the purpose of the Book of Mormon. The title page of the Book of Mormon says it is written "to show unto the remnant of the house of Israel what great things the Lord hath done for their fathers; and that they may know the covenants of the Lord, that they are not cast off forever—And also to the convincing of the Jew and Gentile that Jesus is the Christ..."
When Gabe was set apart as a missionary his blessing said he was called to take the Book of Mormon to his brothers and sisters who are, like him, the children of Father Lehi. Teaching the gospel to the descendants of the Book of Mormon people is one of the primary preparations that must occur before the second coming of the Savior, and Gabe has a very personal part to play in this preparation. Here are some of the scriptures that have come to my mind as I have pondered this:
Enos 12-18 - The Lord covenanted with Enos and his fathers that their record would be preserved and brought forth to their descendants when the time was right.
1 Nephi 15:13-14 - Nephi saw in vision that the fulness of the Gospel would be brought by the Gentiles to the remnant of his seed.
3 Nephi 16 - Christ tells how the gospel will be brought to the descendants of the Nephites and Lamanites.
Mormon chapter 7 - Mormon testifies directly to the latter-day Lamanites.
Gabe, the work you are doing has been foretold for centuries. It is a critical part of the history of the world. Be strong and courageous. God is on your side.