"My Song Is Love Unknown"

Last year, I noticed a small feature in "My Song Is Love Unknown," sung to the tune "Love Unknown."  Here are the fifth and sixth musical phrases:

In the sixth verse, the text here is "What may I say? / Heav'n was His home."  "Home" is sung to a D, and since the tune is in D major, this is the tonic note or musical "home," so the tune mirrors the text here.