In the third verse, the line "With all Christ's foll'wers true" is sung to this musical phrase (from the tune "Jerusalem, du hochgebaute Stadt"):
"All Christ's foll'wers" is sung to the notes A E F# G#. Because one of these (G#) is an accidental, there's an even further sense of breadth.
In the fourth verse, the lines "And all its host rejoices, / And all its blessed throng" (the sense continues into the next line: "Unite their myriad voices," which I've written about before) are sung to these phrases:
"All its host" is sung to the notes B C# D, and "all its blessed throng" to the notes B A G F# E.