Memory card — print it, then learn it by heart. The paper doesn't need charging.

Tantum Ergo (English)

St. Thomas Aquinas · c. 1264

¹Down in adoration falling,

²Lo! the sacred Host we hail,

³Lo! o'er ancient forms departing

⁴Newer rites of grace prevail;

⁵Faith for all defects supplying,

⁶Where the feeble senses fail.

⁷To the everlasting Father,

⁸And the Son Who reigns on high

⁹With the Holy Spirit proceeding

¹⁰Forth from each eternally,

¹¹Be salvation, honour, blessing,

¹²Might and endless majesty. Amen.