Saint Thomas Aquinas was a 13th century theologian. He composed the Eucharistic hymn, Tantum Ergo, which is still used today (Feast Day January 28).

Tantum ergo Sacramentum
veneremur cernui:
et antiquum documentum
novo cedat ritui:
praestet fides supplementum
sensuum defectui.
Genitori, Genitoque
laus et iubilatio,
salus, honor, virtus quoque
sit et benedictio:
procedenti ab utroque
compar sit laudatio.

Down in adoration falling,
Lo! the sacred Host we hail;
Lo! o'er ancient forms departing,
newer rites of grace prevail;
faith for all defects supplying,
where the feeble sense fail.
To the everlasting Father,
and the Son who reigns on high,
with the Holy Ghost proceeding
forth from Each eternally,
be salvation, honor, blessing,
might and endless majesty.

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