God proved that He will always be with us by sending His Son and His Holy Spirit. To confirm this, He gave Isaiah a prophecy that a virgin would conceive and this son of hers would bear the title "Immanuel," or God with us. As we observe Christmas time, we focus on the advent of Jesus, the Word of God made flesh. It was to reconcile creation back to the Father and to establish His Kingdom through us. Be blessed and have a merry Christmas season.
References
Isaiah 7:14
Isaiah 9:6
Luke 2:14
Isaiah 53:3-5
John 18:37
Jeremiah 23:6
Luke 17:21
Romans 10:9-10
KJV/NKJV