Isaiah's prophecy goes beyond the nativity scene. God with us carries much more meaning than Jesus being born in a manger. In fact, it expresses one of the core essentials of the Christian faith— that Jesus Christ is God— that Jesus is God with us, the only hope for humanity.
Now all this took place to fulfill what was spoken by the Lord through the prophet: "BEHOLD, THE VIRGIN SHALL BE WITH CHILD AND SHALL BEAR A SON, AND THEY SHALL CALL HIS NAME IMMANUEL," which translated means, "GOD WITH US." (Matthew 1:22-23)The sheer shockingness of the simple reality of God with us, might not at first be realized. But just think about it for a moment... God with us. God is holy. He is pure, beyond reproach, all good... And He came to earth to dwell among men. He came to dwell among sinful men. Fallen men. Men drenched in unceasing sin, deserving of no mercy, no grace—nothing but condemnation. And yet, God still came to dwell with men! Even more amazing, He came to save men! God will be worshiped and praised for all of eternity, and yet this still is not an adequate response to such uncomprehending love!
In order to gain a better appreciation for God with us, it should be considered what God not with us would be like. God with us means hope. It means mercy, grace, and forgiveness. God not with us means misery. It means justice, punishment, and damnation. God with us is peace. God not with us makes God the enemy. It's war against God. It's a failed attempt at assassinating the eternal God. It's a hopeless situation in which there is nothing to look forward to except eternal suffering. If God is for us, then who can stand against us? (Romans 8:31) But if God is not for us, then we are sure to fall.
Joseph's Obedience and Jesus' Birth - Matthew 1:24-25
Isaiah's Prophecy: It's Fulfillment (Part 1) - Matthew 1:22-23
Jesus' Purpose: To Save His People From Their Sins (Part 1) - Matthew 1:21
Joseph, Do Not Be Afraid to Take Mary as Your Wife - Matthew 1:20
Joseph's Dilemma - Matthew 1:19