Isaiah 9:6-7 → Isaiah 7:14

Isaiah 7:14, delivered to Ahaz in the Syro-Ephraimite crisis (c. 735 BC), gives the house of David a sign — "the virgin will be with child and will give birth to a son, and will call Him Immanuel" (ʿimmānû ʾēl, "with-us-God"). The name declares God's presence and identification with His people in the child but leaves the child's own identity implicit. Isaiah 9:6-7, the next panel of the same Isaianic birth-complex (announced after the darkness of 8:22 gives way to the great light of 9:2), takes up the identical subject-language — a son born "to us" (yeled yullad-lānû… bēn nittan-lānû) — and now makes the implicit explicit: this child is Wonderful Counselor, Mighty God (ʾēl gibbôr), Everlasting Father, Prince of Peace, who "will reign on the throne of David… forevermore." What 7:14 supplies as the sign (a son named God-with-us), 9:6-7 supplies as the identity (the son who is in fact ʾēl gibbôr, ruling David's eternal throne). The link is Redemptive-Historical Progression — a later oracle within the same prophetic book advancing and specifying an earlier one on a single divinely-authored horizon — and not typology: there is no type-and-antitype escalation across two historical institutions, but one promised child progressively unveiled (the ATN itself names this a "redemptive-historical advance," and the two oracles "mutually-interpreting"). The Longitudinal Theme strand is the Davidic divine Son (Kingdom + Sonship): Immanuel is the Mighty God who takes David's throne. The trajectory lands in Christ, whom Matthew names Immanuel (Matt 1:23) and whose government has no end — and here is the savor: the One announced as God-with-us comes not as a distant sovereign but as a child given to us, the Mighty God who is also the Prince of our peace, so that to behold Him is to find that the eternal King has bound His glory to our flesh for our joy. He is not merely foretold; He is desirable — the Wonderful Counselor we were made to delight in forever.