From 2 Nephi 6:6–7 and 6:16 to 2 Nephi 9:2, Jacob quoted Isaiah 49:22 to Isaiah 52:2. What was it that had drawn Jacob to these particular words of Isaiah?
First, Jacob was told by Nephi to read these selected words to the assembled people of Nephi (6:4). As prophet and king, Nephi surely wanted to reassure his people that God would protect his people: "the Mighty God shall deliver his covenant people" (6:17; Isaiah 49:25). This fledgling community must have worried and needed this reassurance. And thus, Nephi and Jacob wanted their people especially to be a faithful "covenant people." For that precise reason Jacob spoke to them so they might "know concerning the covenants of the Lord that he has covenanted with all the house of Israel" (9:1).
Second, all the people were to know that "all flesh shall know that I the Lord am thy Savior and thy Redeemer, the Mighty One of Jacob" (6:18; cf. Isaiah 49:26). Jacob, the priest of the temple in the city of Nephi, would have been especially desirous that his people would find redemption and deliverance through Jehovah, their Redeemer. In their isolated state, it was pertinent for them to know of their "deliverance" (Jacob used the word "deliver" or "deliverance" 12 times in 2 Nephi 9) by the Mighty God (Jacob calls Him the Lord God "Almighty" in 9:46). Despite their being more alone than ever before, the Lord had not abandoned them out in the wilderness. Thus, this block of text suited their needs perfectly.
Third, from these words, Jacob hoped that the people were to "learn and glorify the name of your God" (6:4). Previously, Jesus Christ had been called several names, such as "messiah," "the Lamb of God," "the Lord [Jehovah]," and others. Now, in order that they might "learn … the name" of their God, to be used in glorifying Him, Jacob will disclose to his people that his holy name, when he would come among the Jews in the flesh, would be "Christ." That name had been spoken to Jacob by the angel of the Lord during the night (10:3) in the interval between the two days of this coronation and covenant renewal celebration. Because the word "Christ" literally means "anointed," raising that name on the occasion of renewing the people’s covenant to God and loyalty to His anointed king (as kings in Israel were called, Psalm 2:2) would have been especially appropriate.
Finally, Jacob would have been especially pleased at the opportunity to draw his people’s attention to the name for the Lord that was used by Isaiah, "the Mighty One of Jacob" (6:18; Isaiah 49:26).
John S. Thompson, "Isaiah 50–51, the Israelite Autumn Festivals, and the Covenant Speech of Jacob in 2 Nephi 6–10," in Isaiah in the Book of Mormon, ed. Donald W. Parry and John W. Welch (Provo, UT: FARMS, 1998), 123–150.