PANGE LINGUA GLORIOSI: SING, MY TONGUE, THE SAVIOR'S GLORY

Then there was this. 

Wikipedia gets us started:

"Pange lingua gloriosi corporis mysterium" (Ecclesiastical Latin: [ˈpandʒe ˈliŋɡwa ɡloriˈosi ˈkorporis miˈsteri.um]) is a Medieval Latin hymn written by Saint Thomas Aquinas (1225–1274) for the Feast of Corpus Christi. It is also sung on Maundy Thursday during the procession from the church to the place where the Blessed Sacrament is kept until Good Friday. The last two stanzas (called, separately, Tantum ergo) are sung at Benediction of the Blessed Sacrament. The hymn expresses the doctrine that the bread and wine are changed into the body and blood of Christ during the celebration of the Eucharist.

It is often sung in English as the hymn "Of the Glorious Body Telling" to the same tune as the Latin.

The opening words recall another famous Latin sequence from which this hymn is derived: Pange lingua gloriosi proelium certaminis by Venantius Fortunatus.

I am keeping the font size of the text below small so that you can read the English translation side by side with the Latin. 

There are many English translations, of varying rhyme scheme and metre. The following has the Latin text with a doxology in the first column, and an English translation by Edward Caswall in the second.[1] The third column is a more literal rendering.

Pange, lingua, gloriósi Córporis mystérium, Sanguinísque pretiósi, Quem in mundi prétium Fructus ventris generósi Rex effúdit géntium. Nobis datus, nobis natus Ex intácta Vírgine, Et in mundo conversátus, Sparso verbi sémine, Sui moras incolátus Miro clausit órdine. In suprémæ nocte coenæ Recúmbens cum frátribus Observáta lege plene Cibis in legálibus, Cibum turbæ duodénæ Se dat suis mánibus. Verbum caro, panem verum Verbo carnem éfficit: Fitque sanguis Christi merum, Et si sensus déficit, Ad firmándum cor sincérum Sola fides súfficit. Tantum ergo sacraméntum Venerémur cérnui: Et antíquum documéntum Novo cedat rítui: Præstet fides suppleméntum Sénsuum deféctui. Genitóri, Genitóque Laus et jubilátio, Salus, honor, virtus quoque Sit et benedíctio: Procedénti ab utróque Compar sit laudátio. Amen. Alleluja

Sing, my tongue, the Saviour's glory, Of His Flesh, the mystery sing; Of the Blood, all price exceeding, Shed by our Immortal King, Destined, for the world's redemption, From a noble Womb to spring. Of a pure and spotless Virgin Born for us on earth below, He, as Man, with man conversing, Stayed, the seeds of truth to sow; Then He closed in solemn order Wondrously His Life of woe. On the night of that Last Supper, Seated with His chosen band, He, the Paschal Victim eating, First fulfils the Law's command; Then as Food to all his brethren Gives Himself with His own Hand. Word-made-Flesh, the bread of nature By His Word to Flesh He turns; Wine into His Blood He changes: What though sense no change discerns. Only be the heart in earnest, Faith her lesson quickly learns. 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, When the feeble senses fail. To the Everlasting Father And the Son who comes on high With the Holy Ghost proceeding Forth from each eternally, Be salvation, honor, blessing, Might and endless majesty. Amen. Alleluia.