This is a more well-known Christmas hymn. It is very old and hauntingly beautiful. But, let's focus on these words here. It gives us a pretty good picture of the majesty of Christ, but take a look at the title. Let all mortal flesh keep silence. It is talking about how we are nothing compared to Christ, so let us keep silence in awe and homage to our king who came to earth as a mortal man. Notice the last verse. It talks about these sing-winged seraphs. These guys are massive beasts, but take a look at what they are doing. They are worshiping Christ. They are massive and terrifying, but they are nothing compared to the king that they are worshiping. So, enjoy this hymn (and find the tune if you can, it's amazing).
1. Let all mortal flesh keep silence, and with fear and trembling stand; ponder nothing earthly-minded, for with blessing in his hand, Christ our God to earth descendeth, our full homage to demand. 2. King of kings, yet born of Mary, as of old on earth he stood, Lord of lords, in human vesture, in the body and the blood; he will give to all the faithful his own self for heavenly food. 3. Rank on rank the host of heaven spreads its vanguard on the way, as the Light of light descendeth from the realms of endless day, that the powers of hell may vanish as the darkness clears away. 4. At his feet the six-winged seraph, cherubim, with sleepless eye, veil their faces to the presence, as with ceaseless voice they cry: Alleluia, Alleluia, Alleluia, Lord Most High!