"'How Shall They Hear,' Who Have Not Heard"

Months ago, one of the hymns in church was "'How Shall They Hear,' Who Have Not Heard," and I noticed a couple things about it.  The tune is "Angelus," which - with some slight changes - is also used for the "Agnus Dei" in Divine Service, Setting Four in The Lutheran Service Book.  Here's the first musical phrase:

In the second verse, the text here is "'To all the world,' to ev'ry place."  "World" is sung with a melisma, giving a musical sense of the breadth of "ev'ry place."  In the third verse, the text here is "'Whom shall I send?' Who hears the call."  "Send" is sung with that same melisma, which now gives a musical sense of the movement of "send[ing]."

Here's the second musical phrase:

In the fifth verse, the text here is "Spirit of truth, in pow'r come down!" and there's a musical descent to represent that "com[ing] down!"