It appears first in the line "Earth and all its depths adore Him" near the end of the third verse, sung to this musical phrase (from the tune "Jesu, meine Freude"):
"All its depths" is sung to the notes A Bb C.
Later, it's in the line "Hence, all empty glory!" in the fourth verse, sung to this phrase:
"All empty glory" is sung to the notes G F Eb D C. That this group spans a fairly large interval (a fifth) may further emphasize the effect.

