O Come, O Come Emmanuel is one of my favorites because it is rich in theology.
1 O come, O come, Immanuel,
and ransom captive Israel
that mourns in lonely exile here
until the Son of God appear.
Refrain:
Rejoice! Rejoice! Immanuel
shall come to you, O Israel.
2 O come, O Wisdom from on high,
who ordered all things mightily;
to us the path of knowledge show
and teach us in its ways to go. Refrain
3 O come, O come, great Lord of might, who to your tribes on Sinai's height in ancient times did give the law in cloud and majesty and awe. Refrain
4 O come, O Branch of Jesse's stem,
unto your own and rescue them!
From depths of hell your people save, and give them victory o'er the grave. Refrain
5 O come, O Key of David, come
and open wide our heavenly home.
Make safe for us the heavenward road and bar the way to death's abode. Refrain
6 O come, O Bright and Morning Star, and bring us comfort from afar!
Dispel the shadows of the night
and turn our darkness into light. Refrain
7 O come, O King of nations, bind
in one the hearts of all mankind.
Bid all our sad divisions cease
and be yourself our King of Peace.