St. Hilary of Poitiers ~~~ The perfection of learning is to know God in such a way that...
Come adore the wondrous Presence
Bow to Christ the source of Grace
Here is kept the ancient promise
of God's earthly dwelling place
Sight is blind before God's Glory
Faith alone may see His face.
Yes sorry. Tantum Ergo was written by St. Thomas Aquinas. Second to last stanza.