In saying that the Holy Eucharist is the greatest of all the sacraments, we are stating the obvious. Baptism of course is the most necessary sacrament. Yet, despite all the wonderful things that Baptism and the other five sacraments accomplish in the soul, they still are but instruments of God for the giving of grace; while in the Holy Eucharist we have not merely an instrument for the giving of grace—we have the actual Giver of grace himself, Jesus Christ our Lord, truly and personally present. The sacrament of Christ’s body and blood has had many names in the course of Christian history. Such names as Bread of Angels, the Lord’s Supper, the Sacrament of the Altar, are familiar to us. But the name which has endured from the very beginning, the name that the Church officially gives to this sacrament is that of Holy Eucharist. This name is taken from the account of the institution of the Holy Eucharist as it is given in the Bible. All four of the sacred writers, Matthew…Mark…Luke and Paul...tell us that Jesus, as he took the bread and wine into his hands, ‘gave thanks.’ And so from the Greek word, ‘eucharistia,’ which means a ‘giving of thanks’ we have the name of our sacrament: the Holy Eucharist.
Leo Trese, The Faith Explained, pp. 347-348