Having introduced the concept that the true gospel has been given to the disciples, Jesus now explains the essential aspects of that gospel. At the heart of the gospel is not doctrine, but person. The gospel is, at its heart, not doctrines at all, but rather an action, and that action was the atonement of the Atoning Messiah. The heart of the gospel is the condescension of God:
1 Nephi 11:26-27
26 And the angel said unto me again: Look and behold the condescension of God!
27 And I looked and beheld the Redeemer of the world, of whom my father had spoken; and I also beheld the prophet who should prepare the way before him. And the Lamb of God went forth and was baptized of him; and after he was baptized, I beheld the heavens open, and the Holy Ghost come down out of heaven and abide upon him in the form of a dove.
Nephi saw the unfolding of the gospel, and in his vision as well as in the Savior’s explanation, it begins with the mission of the Atoning Messiah.