Isaiah 9:6-7 describes the Messiah as 'Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace' who will establish endless peace on David's throne forever.

The ANE royal-titulary parallel is a real, respectable critical-scholarly point and should not be dismissed -- Egyptian pharaonic fivefold titularies do include exalted epithets for human kings. But this explanation is harder to sustain for 'El Gibbor' (Mighty God) specifically once Isaiah's own usage is checked: the identical phrase 'El Gibbor' recurs in Isaiah 10:21, just one chapter later, in an unambiguous statement about YHWH himself ('a remnant will return, the remnant of Jacob, to the Mighty God'). If the same author uses the same two-word phrase for God without any hyperbolic sense a few verses on, the 'mere court flattery' reading for 9:6 becomes strained -- the term is not merely decorative elsewhere in this author's own work. John Oswalt's NICOT commentary on Isaiah and J. Alec Motyer's Isaiah commentary both press this internal-usage argument at length. This is a striking datum from the Hebrew text itself, independent of the New Testament: a promised, humanly-born Davidic child is given a title the same book uses unambiguously for God. On 'endless peace': the same already/not-yet structure applies here as in Isaiah 2. Luke's annunciation narrative directly alludes to this text and to 2 Samuel 7 together: 'the Lord God will give to him the throne of his father David... he will reign over the house of Jacob forever, and of his kingdom there will be no end' (Luke 1:32-33) -- asserting inauguration in Christ's reign, with consummation still future.

The convergence, within a single unbroken sentence, of ordinary human birth language ('a child has been born for us, a son given to us') and unambiguous divine titulature ('Mighty God,' matching Isaiah's own usage for YHWH) is precisely the paradox the doctrine of the incarnation exists to explain. This tension is native to the Hebrew text itself and long predates Christian doctrinal formulation.