What Makes a Sacrament Valid? Matter, Form, Minister and Intention

A News Story Explained

In August 2020, the Vatican confirmed that baptisms performed with the words “We baptise you” instead of “I baptise you” are invalid. Soon afterwards, a priest in Detroit watched a video of his own baptism and heard the deacon use exactly that formula. He discovered that he had never been validly baptised, and therefore had never been validly ordained. Similar cases followed elsewhere, including in Phoenix in 2022, where thousands of baptisms had to be repeated.

Many people found this baffling. How could one word make such a difference? Is God really that legalistic?

To understand it, we need to look at what the Church teaches about how sacraments work.

Sacraments Are Signs That Do What They Signify

The sacraments are “efficacious signs of grace, instituted by Christ and entrusted to the Church” (CCC 1131). They are signs: they mean something. And they are efficacious: they actually bring about what they mean.

Baptism’s washing with water signifies cleansing from sin, and it really does cleanse. The Eucharist’s bread signifies nourishment, and it really is the Bread of Life.

Because sacraments are signs, the sign has to be right. If the sign is changed so that it no longer means what Christ intended, it no longer does what Christ promised.

Matter and Form

Medieval theologians, following a pattern from St Augustine, analysed each sacrament into two elements.

Matter is the physical element or action: water for Baptism; wheat bread and grape wine for the Eucharist; oil and the laying on of hands for Confirmation; the confession of sins for Penance.

Form is the words that give the matter its specific meaning: “I baptise you in the name of the Father, and of the Son, and of the Holy Spirit”; “This is My Body.”

Augustine put it simply: the word comes to the element, and it becomes a sacrament.

If the matter is wrong (if, for instance, Mass is celebrated with rice cakes and juice), there is no sacrament. If the form is substantially changed, likewise.

Why “We” Matters

The Congregation for the Doctrine of the Faith gave that ruling in 2020. In 2024, the Dicastery for the Doctrine of the Faith explained the principle more fully in a note called Gestis verbisque (“By deeds and words”).

The reason is not a fussy attachment to grammar. In Baptism, the minister acts in the person of Christ. It is Christ who baptises. The formula “I baptise you” expresses that a single minister acts for Christ. “We baptise you,” usually meant to express that the whole community is involved, changes the meaning: it suggests the community is the one acting. The sign no longer signifies what Christ instituted.

Gestis verbisque reminded priests that they have no authority to alter the sacramental forms, however good their intentions. The sacraments belong to Christ and His Church, not to the individual minister.

The Minister

Each sacrament has a proper minister.

Anyone can baptise in an emergency, even a non-Christian, provided they use water, the correct words and intend to do what the Church does (CCC 1256).
Only a priest or bishop can validly celebrate the Eucharist, absolve sins or anoint the sick.
Only a bishop can validly ordain.
In the Latin Church, the spouses themselves are the ministers of Marriage.

The Intention

The minister must have at least the intention “to do what the Church does” (Council of Trent). He need not have perfect faith or understanding. He need not even believe what the Church believes about the sacrament. But he must intend to perform the Church’s rite, not, say, a theatrical rehearsal or a joke.

This is a minimal requirement. It exists to make sure that the sacrament is a genuine act of the Church, not a parody of one.

Ex Opere Operato

One of the most important principles is that sacraments work ex opere operato, “by the very fact of the action being performed” (CCC 1128).

This principle was hammered out in the fourth and fifth centuries against the Donatists, who held that sacraments administered by priests who had betrayed the faith in persecution were invalid. St Augustine argued that the true minister of every sacrament is Christ. A sinful priest can validly baptise, because “it is Christ who baptises.”

This is enormously reassuring. Catholics do not have to wonder whether their priest is holy enough for their confession to count. If the sacrament is validly celebrated, Christ acts.

Valid but Fruitful?

A sacrament can be valid but not fruitful. The grace offered depends also on the disposition of the person receiving it (CCC 1128). Someone who receives Communion in a state of mortal sin receives Christ truly, but not to his benefit; St Paul warns that such a person “eats and drinks judgement upon himself” (1 Corinthians 11:29).

Validity concerns whether the sacrament takes place. Fruitfulness concerns whether we receive its grace.

Valid but Unlawful?

Another distinction matters too. A sacrament can be valid but illicit (unlawful). For example, a priest who celebrates Mass without permission in a forbidden place still consecrates validly, but he acts wrongly. The Eucharist is real; the act is disobedient.

Orthodox sacraments are a good example of the reverse case. The Catholic Church recognises Orthodox sacraments as valid, because the Orthodox have kept apostolic succession and the proper rites (CCC 838).

The Church Supplies

What about cases of honest error? In certain situations, Church law provides that “the Church supplies” what is lacking (canon 144). This applies to questions of a minister’s jurisdiction or faculties, for example when a priest hears confessions believing in good faith that he has permission. It does not apply to defects of matter or form, which are not the Church’s to supply, because they belong to the sacrament as Christ instituted it.

Not Legalism

All of this can sound legalistic. But it is really a matter of humility and confidence.

Humility, because no priest, bishop or community owns the sacraments. They are Christ’s gifts, received and handed on, not invented.

Confidence, because the Church guarantees that, when her rites are faithfully followed, Christ is truly at work. A Catholic who is baptised, absolved or fed at Mass can be certain that Christ has acted, not because of the minister’s holiness or eloquence, but because of Christ’s promise.