"My Song Is Love Unknown"

Last year, I watched the Concordia University Wisconsin chapel service from 10 April.  The hymn was "My Song Is Love Unknown," and I noticed a small feature in it.

The hymn is sung to the tune "Love Unknown."  Here are the last four musical phrases:

In the seventh verse, the text here is "This is my friend, / In whose sweet praise / I all my days / Could gladly spend!"  The phrase "all my days" is sung to notes of all different pitches (F# G A), lending a slight sense of this breadth or entirety.