In the history of man, through all the rush and bustle, there was one day when all of Heaven held their collective spiritual breath. That was the day Jesus came to dwell among His creation in human form. The birth of Jesus was not His first visit to the earth that He spoke into existence, but it was the first time He came as one of us.
While remaining fully God, He at the same time became fully man, so He could become the sacrifice we so desperately need. The birth of Christ was a brief respite from the normal goings-on of the world. From that moment, nothing would ever be the same again.