For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counselor, The mighty God, The everlasting Father, The Prince of Peace (Isaiah 9:6).
How else could this prophecy be fulfilled without the Incarnation? The Messiah is The Mighty God. How else could this be fulfilled unless the Father and Christ are one? Amazing! So as we wait in anticipation, here is my favorite advent hymn: