Tantum Ergo is the last two stanzas from the Eucharistic Hymn (Pange Lingua) composed by St. Thomas Aquinas and is used at Benediction of the Blessed Sacrament. The response and the prayer at the end is a later addition used at Benediction. A partial indulgence is granted to the faithful who recite it and a plenary indulgence is granted to those who recite it on Holy Thursday or Corpus Christi.

TANTUM ergo Sacramentum
Veneremur cernui:
Et antiquum documentum
Novo cedat ritui:
Praestet fides supplementum
Sensuum defectui.

DOWN in adoration falling,
Lo! the sacred Host we hail,
Lo! oe'r ancient forms departing
Newer rites of grace prevail;
Faith for all defects supplying,
Where the feeble senses fail.

Genitori, Genitoque
Laus et iubilatio,
Salus, honor, virtus quoque
Sit et benedictio:
Procedenti ab utroque
Compar sit laudatio.

Amen.

To the everlasting Father,
And the Son Who reigns on high
With the Holy Spirit proceeding
Forth from each eternally,
Be salvation, honor blessing,
Might and endless majesty.

Amen.