THE REVELATION OF THE EUCHARIST
The holy Eucharist completes Christian initiation. . . The Eucharist is the efficacious sign and sublime cause of that communion in the divine life and that unity of the People of God by which the Church is kept in being.
- CCC, nos. 1322 and 1325, citing Sacred Congregation of Rites,
Instruction on the Worship of the Eucharistic Mystery
(Eucharisticum Mysterium), no. 6
The origins of the Eucharist are found in the Last Supper that Jesus shared with his Apostles. "In order to leave them a pledge of this love, in order never to depart from his own and to make them sharers in his Passover, he instituted the Eucharist as the memorial of his death and Resurrection and commanded his apostles to celebrate it until his return; 'thereby he constituted them priests of the New Testament'" (CCC, no. 1337, citing Council of Trent: DS 1740).
So rich is this mystery that we have a number of terms to illumine its saving grace: the Breaking of the Bread; the Lord's Supper; the Eucharistic Assembly; the Memorial of Christ's Passion, Death, and Resurrection; the Holy Sacrifice of the Mass, the Holy and Divine Liturgy; the Eucharistic Liturgy; Holy Communion; and Holy Mass (cf. CCC, nos. 1328-1332).
The use of bread and wine in worship is already found in the early history of God's people. In the Old Testament, bread and wine are seen as gifts from God, to whom praise and thanks are given in return for these blessings and for other manifestations of his care and grace. The story of the priest Melchizedek's offering a sacrifice of bread and wine for Abraham's victory is an example of this (cf. Gn 14:18). The harvest of new lambs was also a time for the sacrifice of a lamb to show gratitude to God for the new flock and its contribution to the well-being of the family and tribe.
These ancient rituals were given historical meaning at the Exodus of God's people. They were united into the Passover Meal as a sign of God's delivering the Israelites from slavery in Egypt, a pledge of his fidelity to his promises and eventually a sign of the coming of the Messiah and messianic times. Each family shared the lamb that had been sacrificed and the bread over which a blessing had been proclaimed. They also drank from a cup of wine over which a similar blessing had been proclaimed.
When Jesus instituted the Eucharist he gave a final meaning to the blessing of the bread and the wine and the sacrifice of the lamb. The Gospels narrate events that anticipated the Eucharist. The miracle of the loaves and fish, reported in all four Gospels, prefigured the unique abundance of the Eucharist. The miracle of changing water into wine at the wedding feast in Cana manifested the divine glory of Jesus and the heavenly wedding feast in which we share at every Eucharist.
In his dialogue with the people at Capernaum, Christ used his miracle of multiplying the loaves of bread as the occasion to describe himself as the Bread of Life: "I am the living bread that came down from heaven. . . . Unless you eat the flesh of the Son of Man and drink his blood, you do not have life within you" On 6:51, 53).
THE LAST SUPPER
The account of the institution of the Eucharist may be found in the Gospels of Matthew, Mark, and Luke as well as in Paul's First Letter to the Corinthians (see Mt 26:17-29; Mk 14:12-25; Lk 22:7-20; 1 Cor 11:23-26). Jesus chose the Passover feast as the time in which he would institute the Eucharist and would undergo his dying and rising (d. CCC, nos. 1339-1340). With the institution of the Eucharist, Jesus gave the Passover its new and definitive meaning. He showed himself to be the High Priest of the New Covenant, offering himself as a perfect sacrifice to the Father. Jesus changed the bread and wine into his Body and Blood, given now as an offering for the salvation of all people.
For I received from the Lord what I also handed on to you, that the Lord Jesus, on the night he was handed over, took bread, and, after he had given thanks, broke it and said, "This is my body that is for you. Do this in remembrance of me." In the same way also the cup, after supper, saying, "This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me." For as often as you eat this bread and drink the cup, you proclaim the death of the Lord until he comes. (1 Cor 11:23-26)
By the words "Do this in memory of me," Jesus commanded the Apostles and their successors to repeat his actions and words "until he comes again." From earliest times, the Church has remained faithful to this command. Particularly on Sunday, the day of Christ's Resurrection, the faithful has gathered for the Breaking of the Bread. This practice has continued unbroken for two thousand years right up to the present day.
In the Gospel of John, instead of an account of the institution of the Eucharist, there is the narrative of the foot washing Un 13:1-20) at the beginning of the Last Supper, which sets the tone of humble service, exemplified by Christ and fulfilled in his death on the Cross. The Church has selected this Gospel for the Holy Thursday liturgy, highlighting Christ's teaching: "If I, therefore, the master and teacher, have washed your feet, you ought to wash one another's feet. I have given you a model to follow, so that as I have done for you, you should also do" On 13:14-15).
Christ's Last Supper Discourse Un 14:1-17:26) reflects Eucharistic. themes of divine love, a union with Christ as intimate as a branch is to a vine, and a priestly prayer for the Apostles and those who would believe through them.
THE MASS FOR THE ROMAN RITE
Since the second century, the Mass (or the Eucharistic Liturgy) has had a structure that is common to all Catholics. While there can be different emphases during the celebration of Mass in Eastern Churches, they maintain the fundamental twofold structure with which members of the Latin Church are familiar. Thus, the Mass unfolds in two major parts that form a single act of worship. First, there is the Liturgy of the Word, with Scripture readings, homily, Profession of Faith, and General Intercessions. Second, there is the Liturgy of the Eucharist, with the presentation of the bread and wine, the Eucharistic Prayer, and the reception of Holy Communion. The essential elements of Eucharistic celebrations may be summarized in the following four points.