Meaning of tantum ergo
Based on the information I found online, "Tantum ergo" is the incipit or opening lines of a hymn by Saint Thomas Aquinas called "Pange Lingua". Incipit means "it begins".
The lyrics "Tantum ergo sacramentum" translate to "Therefore so great a sacrament". The hymn praises and venerates the sacrament of the Eucharist, in which the bread and wine become the body and blood of Christ.
"Tantum ergo" is often sung or chanted during Adoration and Benediction of the Blessed Sacrament in the Catholic Church , when Catholics meditate and pray before the consecrated host.
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