The line "And grant us life forever" is sung to this phrase:
"Forever" is sung with a melisma (F E D C), musically giving a sense of duration.
"With humble hearts and lowly" is sung to this phrase:
"Lowly" is sung to a group of descending notes (E D C), musically giving a sense of a bowing humility. It's also sung with a melisma, which emphasizes the effect.
"With all true Christians running" is sung to this phrase:
"Running" is sung with a melisma (B A G), musically giving a sense of movement. It's also sung diatonically, so there's even a musical representation of individual steps.
