Before the manger, before Bethlehem, before the world was made, Jesus already existed. John tells us that the baby born in the manger is the eternal Word, fully God, the One through whom all things were created.
This is the wonder of Christmas. The Creator stepped into His creation, and the Light stepped into our night. The same Word who spoke galaxies into being now speaks life into weary hearts. Jesus did not come only to inspire us, He came to bring real life to those who trust Him.