Liturgy of the Eucharist

Members of the congregation bring forward the gifts of bread and wine — the fruits of human labor that will become the Body and Blood of Christ. The priest receives the gifts and places them on the altar. He prays quietly: 'Blessed are you, Lord God of all creation, for through your goodness we have received the bread (wine) we offer you: fruit of the earth (vine) and work of human hands, it will become for us the bread of life (our spiritual drink).' A collection is typically taken at this time as the people's material offering. The priest may add a drop of water to the wine, symbolizing the union of Christ's divinity with our humanity.

After the preparation, the priest washes his hands — a symbolic act of inner purification — while praying quietly, 'Wash me, O Lord, from my iniquity and cleanse me from my sin.' He then invites the people: 'Pray, brethren, that my sacrifice and yours may be acceptable to God, the almighty Father.' The people respond with a prayer asking God to accept the sacrifice. The priest then says the Prayer over the Offerings, a variable prayer that asks God to sanctify the gifts.

The Eucharistic Prayer is the center and summit of the entire Mass. It begins with the Preface Dialogue: 'The Lord be with you / And with your spirit. Lift up your hearts / We lift them up to the Lord. Let us give thanks to the Lord our God / It is right and just.' The Preface is a prayer of thanksgiving that varies according to the liturgical season or feast day, giving thanks for God's saving work. There are over 80 different prefaces in the Roman Missal. The Preface concludes by leading into the Sanctus.

The Sanctus is taken from Isaiah 6:3, where the seraphim cry out in the heavenly temple, and from Matthew 21:9, the cry of the crowds on Palm Sunday. By singing or reciting it, the earthly assembly joins its voice to the unending hymn of the angels and saints in heaven. This is a profound moment of union between the Church on earth and the Church in glory.

The Epiclesis (Greek for 'invocation') is the moment when the priest extends his hands over the gifts of bread and wine and calls upon the Holy Spirit to transform them. This is the power of God at work — not the priest's own power. The priest prays: 'Make holy, therefore, these gifts, we pray, by sending down your Spirit upon them like the dewfall, so that they may become for us the Body and Blood of our Lord Jesus Christ.' The bell may be rung to alert the faithful.

This is the most sacred moment of the Mass. The priest, acting in the person of Christ (in persona Christi), repeats the words Jesus spoke at the Last Supper. Over the bread: 'Take this, all of you, and eat of it, for this is my Body, which will be given up for you.' Over the chalice: 'Take this, all of you, and drink from it, for this is the chalice of my Blood, the Blood of the new and eternal covenant, which will be poured out for you and for many for the forgiveness of sins. Do this in memory of me.' At this moment, transubstantiation occurs — the substance of bread and wine is wholly converted into the substance of Christ's Body and Blood, while the appearances remain. The priest genuflects in adoration. Bells are rung.

Immediately after the Consecration, the priest sings or says 'The mystery of faith,' and the people respond with one of three acclamations proclaiming the Paschal Mystery. This acclamation is the assembly's faith-filled response to the miracle they have just witnessed.

The Lord's Prayer is the perfect prayer given by Christ Himself (Matthew 6:9-13). It is prayed by the entire assembly with hands extended or joined. After the prayer, the priest adds the embolism: 'Deliver us, Lord, we pray, from every evil, graciously grant peace in our days...' and the people conclude with the doxology: 'For the kingdom, the power and the glory are yours now and for ever.'

The Rite of Peace follows the Lord's Prayer. The priest prays for peace and unity and then offers the peace of Christ: 'The peace of the Lord be with you always.' The people respond 'And with your spirit.' The deacon or priest then invites: 'Let us offer each other the sign of peace.' This exchange — usually a handshake, bow, or embrace — is not merely a social greeting but a liturgical act expressing the communion and charity of the Body of Christ before receiving the Eucharist.

During the Agnus Dei, the priest breaks the consecrated host — a gesture called the Fractio Panis (Breaking of the Bread), one of the oldest names for the Eucharist. A small piece of the host is placed into the chalice, symbolizing the unity of the Body and Blood of Christ. The assembly sings or recites: 'Lamb of God, you take away the sins of the world, have mercy on us' (twice), then 'Lamb of God, you take away the sins of the world, grant us peace.' This prayer echoes John the Baptist's proclamation of Jesus (John 1:29).

Before distributing Communion, the priest elevates the host and says: 'Behold the Lamb of God, behold him who takes away the sins of the world. Blessed are those called to the supper of the Lamb.' The people respond: 'Lord, I am not worthy that you should enter under my roof, but only say the word and my soul shall be healed.' The priest receives Communion first, then distributes to the faithful. The minister says 'The Body of Christ' and the communicant responds 'Amen.' This 'Amen' is the most important one a Catholic ever says — it affirms belief in the Real Presence. Catholics must be in a state of grace and have fasted for at least one hour before receiving.