The resurrection, security and blessedness of the new Jerusalem, founded on the resurrection of Christ, and therefore now received into the heart by faith, as fully noticed elsewhere.
Christ is here viewed as risen; see chapter 53: 10, and becomes a source of life to "everyone that thirsteth" calls in grace, establishes the sure mercies of David; see Acts 13:34. He is a Witness—a Leader to the people. Nations shall run, that knew not, to Him, because the Lord, the Holy One of Israel, had glorified Him.
This it seems to me, however, speaks of Christ in His relationship with Israel, and therefore He adds, "If God" (as such, for it so was) "be glorified in him," the Son of man, "God shall also glorify him in himself, and shall straightway glorify him." But here it is resurrection and glory with Israel. We can introduce much more, but this grace, and call by grace, leads to summons to repentance, and "Seek the Lord while near," and the assurance, largeness, and certain accomplishment of the word of promise in blessing, so that this blessing should be to the Lord for a name—He should be known by this.