"O Perfect Life of Love" is sung to the tune "Southwell," whose last two phrases descend:
The text of the first verse is:
O perfect life of love!
All, all, is finished now,
All that He left His throne above
To do for us below.
The last two lines of this, which mention that "He left His throne above" to come to "us below" are what are sung to this descending musical phrase. The descent in the text is mirrored by the descent in the tune.