Why the Mass is a sacrifice

Language matters. We often assume we understand what others mean, yet theology can be especially challenging because many of its words and expressions feel far removed from the everyday language of ordinary people. The Mass, too, can seem at first glance like something distant from our day‑to‑day experience. Most children in Ireland, at least, are not familiar with the sounds, rhythms, and symbols of the Eucharist. Religious instruction in schools is uneven, and apart from the major rites of passage – First Holy Communion and Confirmation – many children have little regular or deep contact with the sacraments. At least, that is how it appears to me.

When we tell children or adults that the Mass is a sacrifice, we need to explain it in simple terms, using real‑world examples and relatable stories. Others will be far better than I am at doing this, but clarity is essential.

Let me summarise my own understanding, directly from the Catechism of the Catholic Church (no. 1366):

The Eucharist is a sacrifice because it re‑presents (makes present) the sacrifice of the Cross; because it is the memorial of Christ’s Passover; and because it applies the fruits of that sacrifice to our lives today.

This is the heart of the Church’s teaching: the one sacrifice of Christ is not repeated, but made present sacramentally so that we may share in its saving power.