Jacob explains that Isaiah’s prophecy of the future actually now deals with the past—a fulfilled prophecy—but a past known only by revelation. Because the promised blessings will come through the Gentiles, Jacob must explain why. The Lehites left Jerusalem before it had been captured, although that event was imminent. Nevertheless, Laman and Lemuel had persistently complained that this fall was only visionary—not, for them, a historical fact. Jacob reiterates Lehi’s and Nephi’s testimony of Jerusalem’s fall with his personal revelatory knowledge. The glory of Jerusalem is no more—the necessary prerequisite to the city’s restoration by the Gentiles. However, even though Jacob begins his exposition with an Old World prophet and prophecy, he now explains the meaning of these events as they apply to the Nephites in the New World.