The earlier chapters set out the deep disappointment of God (despite giving them very incentive), concerning his people's commitment to Him. King Ahaz lets a promise of miracle on the part of God to save the situation fall to the ground. Though the promise is not taken up it is not withdrawn. Isaiah develops this promise under the inspiration of the Holy Spirit (1 Peter 1:10-12) which finds it fulfilment in Christ. The words used by the prophet to describe this great personage are no exaggeration (use of hyperbole), for the Christmas angels (Luke 2:1-20) and Jesus confirms it. (Luke 4:14-21).
But this glorious message was no longer about deliverance from earthly foes but the greater enemies of sin and death. It was not only a message to 'the haves', those walking the corridors of power in Jerusalem, but also to the 'have nots' (Micah 5:2) for like the national hero and King David, born in Bethlehem, another Son given, David's Greater Son' would be born amongst them. The carol …. O holy child of Bethlehem descend to us we pray. Cast out our sin, and enter in, be born in us today. We heard the Christmas angels their great glad tidings tell. Oh come to us! Abide with us! Our Lord, Immanuel.