Messiah! These chapters are full of Messianic prophecies:
“Behold, the virgin shall conceive and bear a son, and shall call his name Immanuel” (7:14).
“For to us a child is born, to us a son is given” (9:6).
“There shall come forth a shoot from the stump of Jesse, and a branch from his roots shall bear fruit.”(Isa. 11:1).
Hear Charles Spurgeon (In fact, actually hear -- https://johntracy.me/2019/12/20/immanuel-god-with-us-charles-spurgeon-on-isaiah-714-15/ -- the words of Spurgeon. Oh, my goodness!):
“Immanuel.” It is wisdom’s mystery, “God with us.” Sages look at it, and wonder; angels desire to see it; the plumb-line of reason cannot reach half-way into its depths; the eagle wing of science cannot fly so high, and the piercing eye of the vulture of research cannot see it. “God with us.” It is hell’s terror. Satan trembles at the sound of it; his legions fly apace, the black-winged dragon of the pit quails before it. Let him come to you suddenly, and do you but whisper that word, “God with us,” back he falls, confounded and confused. Satan trembles when he hears that name, “God with us.” It is the laborer’s strength; how could he preach the gospel, how could he bend his knees in prayer, how could the missionary go into foreign lands, how could the martyr stand at the stake, how could the confessor own his Master, how could men labor if that one word were taken away? “God with us.” ’Tis the sufferer’s comfort, ’tis the balm of his woe, ’tis the alleviation of his misery, ’tis the sleep which God gives to His beloved, ’tis their rest after exertion and toil. Ah! And to finish, “God with us”—’tis eternity’s sonnet, ’tis heaven’s hallelujah, ’tis the shout of the glorified, ’tis the song of the redeemed, ’tis the chorus of angels, ’tis the everlasting oratorio of the great orchestra of the sky. “God with us.”