The Holy Sacrifice of the Mass: From the Early Church to Today

From the beginnings of Christianity, the Church has gathered around the mystery so profound that it has shaped her identity, sustained her saints, and sanctified the worldly order: the Holy Sacrifice of the Mass. Neither later invention nor a mere communal gathering, the Sacrifice of the Mass stands in organic continuity with the worship of the Apostles themselves. It is a living tradition rooted in Christ and handed down through the centuries.

The Mass in the Early Church

One of the clearest descriptions of the worship of the first Christians comes to us from Justin Martyr in his First Apology (c. 150 AD). Writing in defense of Christianity to the Roman emperor, Justin describes a liturgy familiar to Catholics today.

The faithful gathered on Sunday. The Scriptures were read, followed by a homily. Then came prayers, the kiss of peace, and the offering of bread and wine mixed with water. The presider gave thanks to the Father through the Son in the Holy Spirit, and Holy Communion was distributed (as well as taken to those absent). During what we call the offertory the wealthy contributed towards the support of the poor.

Most importantly, Justin makes an unmistakable claim: the Eucharist is not ordinary food. It is the true Flesh and Blood of Jesus Christ. In the First Apology he himself said, "in like manner as Jesus Christ our Saviour, having been made flesh by the Word of God, had both flesh and blood for our salvation, so likewise have we been taught that the food which is blessed by the prayer of His word, and from which our blood and flesh by transmutation are nourished, is the flesh and blood of that Jesus who was made flesh.”

Already, in the second century, we see the essential structure of the Mass: Liturgy of the Word and Liturgy of the Eucharist (also called the Mass of the Catechumens and the Mass of the Faithful).

The Eucharist: Sacrifice and Presence

Centuries later, the preeminent theologian of the holy Church, Thomas Aquinas, would give precise scholastic expression to what the Church had always believed.

The Eucharist is called many things: sacrifice, communion, Eucharist (thanksgiving), and viaticum (food for the journey). Each name reveals something true, but at its heart, the Mass is the sacramental re-presentation of Christ’s one sacrifice on the Cross.

Christ is not sacrificed again in a new way. Rather, that one everlasting sacrifice is made present to us. As the Church teaches, the Mass is the same sacrifice as Calvary, now offered in an unbloody manner.

At the moment of consecration, through the words of Christ spoken by the priest, a miraculous change occurs: the substance of bread and wine becomes the Body and Blood of Christ. This is what the Church calls transubstantiation. The appearances (or accidents) remain such as taste and texture, but the substance itself is changed.

Christ is present whole and entire, Body, Blood, Soul, and Divinity under each species. This is why even the smallest fragment of the Eucharist is worthy of the utmost reverence.

The Mass as the Center of Christian Life

The Catechism of the Catholic Church calls the Eucharist “the source and summit of the Christian life.” Everything in the Church flows toward it, and everything also flows from it.

In the Mass, heaven and earth meet. We are united not only with Christ, but with the entire Church; militant, suffering, and triumphant. The liturgy is not a human action; it is the action of Christ Himself, the High Priest, acting through His Body.

As Sacrosanctum Concilium teaches, the liturgy is a foretaste of the heavenly worship in the new Jerusalem. When we attend Mass, we step into eternity.

The Structure and Meaning of the Mass

Despite developments over time, the fundamental structure of the Mass has remained unchanged:

• Liturgy of the Word or Mass of the Catechumens: God speaks to His people through Scripture; the faithful meditate on the words and receive instruction.
• Offertory: Bread and wine are offered, along with the sacrifices of our lives.
• Eucharistic Prayer (Anaphora): The heart of the Mass, including the consecration.
• Communion: The priest receives Christ Himself, and the faithful if properly disposed.

Every gesture, prayer, and symbol carries meaning. The breaking of the Host recalls Christ’s Passion. The mingling of water and wine points to the union of Christ and His Church. The sign of the cross repeated throughout the liturgy reminds us that everything flows from Calvary.

As Francis de Sales beautifully reflected, the Mass mirrors the Passion itself; from the agony in the garden to the crucifixion.

Worthy Reception and Spiritual Fruits

The Eucharist is not eaten as common food, it must be received worthily. St. Paul warns that to receive unworthily is to bring judgment upon oneself (cf. 1 Corinthians 11:29). A soul in mortal sin must first be reconciled through confession. As Aquinas explains, the Eucharist is food for the living, not the dead. Yet for those properly disposed, it brings immense grace:

• Forgiveness of venial sins
• Growth in charity
• Strength against future sin
• A foretaste of eternal life
• It is both nourishment and protection, a remedy for weakness and a shield against evil.

The Mass Through History and Today

From the ancient liturgies of St. James and St. Mark, through the medieval theology of Aquinas, to the clarifications of the Council of Trent, the Church has consistently upheld the Mass as a true sacrifice.

The reforms following the Second Vatican Council sought to deepen participation and understanding, while preserving the substance of the tradition. When celebrated reverently in accord with the rubrics, the modern Mass remains essentially in continuity with what Christians have always believed.

Yet challenges remain. A loss of reverence, misunderstanding of the sacrificial nature of the Mass, and a tendency to focus on the community rather than God can obscure the mystery. External appearances of participation are often at odds with true interior spiritual participation. Some of the current practices, especially lay ministries, are questionable based on concerns from both the tradition and practical realities. 

As Benedict XVI warned, when the liturgy becomes centered on human activity, it risks losing its essence.

A Call to Reverence

If the Mass is truly the sacrifice of Christ made present, then nothing could be more important. We are not spectators. By our presence we are made participants in the greatest act of worship on earth. Not as revelers or “worship leaders,” but in a true solemn spirit as is fitting with the patrimony of the Roman Mass, in imitation of St. John and Our Lady at the foot of the Cross. We are there to offer ourselves to Him as He offers Himself for us. All other roles and ministries pale before the Eucharistic Lord and lose their meaning if they are not focused solely on Him. 

The renewal of the Church begins here, not in programs or strategies, but in reverence. Reverence in how we attend Mass, how we receive Holy Communion, how we pray, and how we live afterward. Frequent worthy reception of the Eucharist, Eucharistic adoration, and a deeper study of the liturgy can transform not only individual souls but entire communities. Lex Orandi Lex Credendi. 

The Holy Sacrifice of the Mass is the heartbeat of the Church. It is Christ’s gift of Himself which He left to us so that we would not be orphans. From the gatherings described by Justin Martyr to the altars of today, the same mystery endures: Christ offers Himself to the Father, and gives Himself to us.

And so, with humility and awe, we echo the words of the Church at every Mass:

“Lord, I am not worthy…”