"Eternal Spirit of the Living Christ"

In The Lutheran Service Book, "Eternal Spirit of the Living Christ" is sung to the tune "Farley Castle," but in Lutheran Worship, it's sung to the tune "Adoro te devote."  Here's the first musical phrase:

The first verse begins with the title line:  "Eternal Spirit of the living Christ."  "Eternal" is sung with a melisma (D F# A A), and since it's stretched out, there's something of a sense of the word's meaning.