The first Christmas carol, after all, was a war hymn. Mary of Nazareth sings of God’s defeat of his enemies, about how in Christ he had demonstrated his power and “has brought down the mighty from their thrones and exalted those of humble estate” (Lk. 1:52). There are some villains in mind there.
Simeon’s song, likewise, speaks of the “fall and rising of many in Israel” and of a sword that would pierce the heart of Mary herself. Even the “light of the Gentiles” he speaks about is in the context of warfare. After all, the light, the Bible tells us, overcomes the darkness (Jn. 1:5), and frees us from the grip of the devil (2 Cor. 4).
In a time of obvious tragedy, the unbearable lightness of Christmas seems absurd to the watching world. But, even in the best of times, we all know that we live in a groaning universe, a world of divorce courts and cancer cells and concentration camps. Just as we sing with joy about the coming of the Promised One, we ought also to sing with groaning that he is not back yet (Rom. 8:23), sometimes with groanings too deep for lyrics.
The whole piece here.