I finally found this:
From a sermon delivered by C. H. SPURGEON, some time in the mid 19th century:
"There is a fine old Welsh hymn which I wish I could turn into English without spoiling it-it runs somewhat to this effect-"O Jesus, come forth! Leave the ivory palaces! Your chariot waits for You, Come forth, come forth! Hell trembles before You, all Heaven adores You, earth owns Your sway, men's hearts cannot resist You. Come forth, come forth! Bars of brass You break, gates of iron give way before You; come forth, come forth, O Jesus for Your chariot awaits You now!"