Christmas is the celebration of the keeping of a promise . . . A saving promise.

From Luke 2:8-11:  Now in that same region there were shepherds living in the fields, keeping watch over their flock by night.  Then an angel of the Lord stood before them, and the glory of the Lord shone around them, and they were terrified.  But the angel said to them, ‘Do not be afraid, for see, I am bringing you good news of great joy for all the people:  to you is born this day in the city of David a Savior, who is the Messiah, the Lord.'”

Michael Card (born 1957) is an American singer and songwriter.  He is best known for his contemporary Christian music.  He has also authored several books.