12/08/2026
THE GIRM EXPLAINED
Understanding the Church’s Guide to the Celebration of Mass
Have you ever wondered why the priest does certain things at Mass, why we stand at one moment and kneel at another, why there are moments of silence, why the altar is kissed, why the Gospel receives special honour, or why a priest cannot simply change parts of the Mass because he prefers another way of doing them?
Behind many of these questions is a document that most Catholics have heard about but relatively few have actually read:
The General Instruction of the Roman Missal - the GIRM.
It may sound like a technical handbook for priests and liturgists. But the GIRM actually helps us understand something every Catholic encounters: the celebration of the Mass.
And once we understand what the GIRM is doing, we may begin to experience Mass very differently.
1. WHAT DOES GIRM MEAN?
GIRM stands for General Instruction of the Roman Missal.
It is the Church’s general instruction concerning the celebration of Mass according to the Roman Rite.
The GIRM is found at the beginning of the Roman Missal and provides the principles and directions governing the celebration: the roles of the ministers and faithful, the arrangement of the celebration, the gestures and postures, the use of sacred objects and spaces, the different parts of the Mass, the chants, and many other aspects of the Eucharistic celebration.
But there is an important distinction.
The GIRM is not the Roman Missal itself.
The Roman Missal contains the prayers and liturgical texts of the Mass.
The GIRM explains how those texts and rites are to be celebrated.
Think of it as the Church’s detailed guide to celebrating what is contained in the Missal.
2. WHY DOES THE CHURCH NEED A GUIDE FOR MASS?
Because the Mass does not belong to an individual priest, parish, choir or congregation.
The liturgy is the worship of Christ and His Church.
The Second Vatican Council teaches that the regulation of the sacred liturgy belongs to the authority of the Church and explicitly states that no individual, even a priest, may add, remove or change things in the liturgy on his own authority.
This is an important principle.
A priest certainly has legitimate choices within the liturgical books. Bishops and episcopal conferences also have responsibilities within the limits established by Church law.
But the Mass is not a blank canvas on which every celebrant is free to create his preferred version.
The priest celebrates the liturgy; he does not own the liturgy.
3. IS THE GIRM ONLY FOR PRIESTS?
No.
Although many of its instructions concern the priest and other ministers, the GIRM concerns the celebration as a whole.
It speaks about the bishop, priest, deacon, altar servers, lectors, cantors, extraordinary ministers of Holy Communion and, importantly, the entire assembly of the faithful.
The Second Vatican Council explains that in the liturgy each person should perform all and only those parts that belong to that person by the nature of the rite and the principles of the liturgy.
That means the GIRM helps answer a very practical question:
What is my role at Mass?
The priest has his role.
The deacon has his role.
The lector has a role.
The altar server has a role.
The choir has a role.
And the congregation has a real role too.
4. WHAT DOES THE GIRM HAVE TO DO WITH “ACTIVE PARTICIPATION”?
This is one of the most misunderstood expressions in Catholic liturgy.
When the Church speaks about active participation, she does not simply mean that everybody must be doing something visibly every second.
The Second Vatican Council calls the faithful to full, conscious and active participation in the liturgy, according to the nature of the celebration.
The GIRM expresses this participation through things such as responses, acclamations, singing, listening, bodily postures, gestures and moments of silence.
But participation can also be profoundly interior.
A person who is kneeling silently in adoration is participating.
A person listening attentively to the proclamation of Scripture is participating.
A person praying interiorly during the Eucharistic Prayer is participating.
A congregation does not become more “active” merely because it becomes noisier.
True liturgical participation involves the whole person: body, mind, heart and faith.
5. WHY DO WE STAND, SIT AND KNEEL?
Our postures at Mass are not random traditions invented by individual parishes.
The GIRM gives norms concerning the bodily postures of the faithful, while also recognising that particular circumstances and legitimate local norms can affect how these are observed.
Why does this matter?
Because the body participates in prayer.
Standing, sitting and kneeling communicate different attitudes and help the congregation participate together in the sacred action.
When the entire congregation stands for the Gospel, we are not simply following a social convention.
When we kneel in adoration, our bodies express something our words alone cannot fully express.
When we sit to listen to the readings, our posture supports attentive listening.
The Catechism explains that human beings communicate spiritual realities through signs, language, gestures and actions.
So the liturgy does not merely tell us what to believe.
It also teaches us through what we do.
6. WHY IS THERE SO MUCH SILENCE AT MASS?
Well… ideally, there should be.
The GIRM explicitly provides moments for sacred silence.
And this is something many Catholics can easily overlook.
Silence at Mass is not an interruption in the liturgy.
Silence is itself part of the liturgical action.
After a reading or homily, silence can allow the faithful to reflect on what they have heard.
After Communion, it provides an opportunity for interior prayer and thanksgiving.
Before the Collect, it allows the people to recollect themselves before the priest gathers their prayer into the Church’s prayer.
The Church’s liturgical teaching therefore treats sacred silence as something positive, not as an awkward gap that must immediately be filled with music or announcements.
Sometimes the most appropriate thing we can do at Mass is simply:
be silent and pray.
7. WHY DOES THE PRIEST KISS THE ALTAR?
You may have noticed that the priest and deacon kiss the altar at particular points of the Mass.
This is not because the altar is being treated as a magical object.
The altar has a profound liturgical significance.
It is the place upon which the Eucharistic Sacrifice is celebrated and is honoured within the sacred space.
The Church’s liturgy is filled with gestures of reverence because visible actions communicate invisible realities.
The Catechism explains that liturgical celebrations are woven from signs and symbols, through which spiritual realities are communicated through physical actions and things.
So when you see the priest kiss the altar, bow, genuflect or incense something, these actions are not decorative choreography.
The liturgy is speaking through the body.
8. WHY DOES THE GOSPEL RECEIVE SPECIAL HONOUR?
Have you ever noticed the difference between the treatment of the Gospel and the other readings?
The Gospel is not simply another reading that happens to come later.
In the Gospel, the Church hears Christ proclaiming the Good News.
This is why the Gospel receives particular liturgical honour.
We stand.
We make the triple sign of the Cross.
The Gospel may be accompanied by candles and incense.
The deacon or priest proclaims it with particular reverence.
These actions communicate something very important:
We are not merely listening to information about Jesus.
We are encountering the proclamation of His Gospel within the worship of the Church.
The liturgy itself is profoundly biblical. The Second Vatican Council teaches that Sacred Scripture has the greatest importance in the celebration of the liturgy, supplying the readings, inspiring the Psalms, prayers and liturgical songs, and giving meaning to the Church’s actions and signs.
9. WHAT ABOUT THE EUCHARISTIC PRAYER?
The Eucharistic Prayer is not simply the section where “the priest talks for a long time.”
It is the centre and high point of the entire celebration.
The priest, acting in the person of Christ and exercising his proper ministry, offers the Eucharistic Prayer, while the people participate through their listening, acclamations, responses, silence and prayer.
This is why the congregation should not see itself as an audience watching the priest perform something privately.
The Mass is the action of Christ and His Body, the Church.
The Catechism describes the liturgy as the work of the whole Christ, Head and members, with each person participating according to his or her proper function.
The priest has a unique sacramental role.
The faithful have their own genuine participation.
Different roles do not mean different levels of importance.
They mean different forms of participation in one sacred action.
10. WHY DOES THE GIRM CARE ABOUT MUSIC?
This connects beautifully with our recent post on The Catholic Hymn Book Explained.
Music at Mass is not simply entertainment added to make the celebration lively.
The Church gives specific attention to the chants and songs associated with the different parts of Mass.
There are chants that form part of the structure of the Mass itself, as well as music that accompanies particular processions and actions.
This is why the question should not simply be:
“Is this a beautiful Catholic song?”
A better question is:
“Does this music serve this particular moment of the liturgy?”
Sacred music should help the Church pray and participate, not compete with the liturgical action.
The Second Vatican Council likewise teaches that sacred music is directed toward the glory of God and the sanctification of the faithful.
11. WHY DOES THE GIRM CARE ABOUT THE ALTAR, AMBO, CHAIR AND OTHER SACRED OBJECTS?
Because the Church’s sacred space is not arranged randomly.
The altar, ambo, chair, tabernacle, cross, candles and other sacred furnishings each have their own significance and liturgical function.
The ambo is especially associated with the proclamation of the Word of God.
The altar occupies a central place in the celebration of the Eucharist.
The chair expresses the office of the priest who presides over the assembly.
The tabernacle is connected with the reservation of the Most Blessed Sacrament.
The Church’s physical arrangement therefore helps communicate what is happening spiritually.
Again, this is the Catholic understanding of sacramental symbolism:
visible realities point us toward invisible realities.
12. CAN THE PRIEST CHANGE THINGS IF HE THINKS HIS VERSION IS BETTER?
This is where the GIRM becomes especially relevant.
The priest has legitimate options within the liturgical books.
But he cannot simply decide that he dislikes a particular part of the Mass and replace it with something else.
The Second Vatican Council is remarkably clear on this principle: regulation of the liturgy belongs to the Church, and no other person—even a priest—may add, remove or change anything in the liturgy on his own authority.
This protects the Mass from becoming a reflection of the personality of whichever priest happens to be celebrating.
Imagine attending Mass in different parishes and discovering that each priest had completely rewritten the celebration according to his personal preferences.
The Mass would gradually cease to be recognisably the same Roman Rite.
The Church therefore gives us a common liturgical framework.
13. DOES THAT MEAN EVERY MASS MUST LOOK EXACTLY THE SAME?
No.
This is another important clarification.
The Roman Rite contains legitimate options, variations according to circumstances, approved adaptations and legitimate cultural expressions.
The GIRM itself contains provisions concerning adaptations within the competence of bishops and bishops’ conferences.
So uniformity is not the same thing as unity.
Two Catholic communities may legitimately celebrate the same Roman Rite with some differences in music, language, cultural expression or approved options.
What matters is that those differences remain within what the Church permits.
The goal is not to make every Catholic parish look like a photocopy of another parish.
The goal is to preserve the integrity of the Church’s worship while allowing legitimate diversity.
14. WHAT DOES THE GIRM TEACH THE ORDINARY CATHOLIC?
You do not have to become a liturgist to benefit from understanding the GIRM.
It can change the way you experience Sunday Mass.
You begin to understand why the congregation responds when it does.
Why we stand.
Why we kneel.
Why we sit.
Why the Gospel receives particular honour.
Why the altar is treated with reverence.
Why there are moments when silence is actually required.
Why the Eucharistic Prayer stands at the centre of the celebration.
Why the priest has certain things he may choose and other things he may not simply invent.
And perhaps most importantly, you begin to understand that Mass is not something Father is doing while everyone else watches.
The Mass is the sacred action of Christ and His Church, in which every member of the assembly participates according to his or her proper role.
THE BIGGER CATHOLIC LESSON
The GIRM is not there to make Mass unnecessarily complicated.
It is there because what the Church does in the liturgy matters.
The gestures matter.
The words matter.
The silence matters.
The music matters.
The sacred vessels matter.
The arrangement of the sanctuary matters.
The roles of the ministers matter.
And the way we participate matters.
The liturgy is not merely something we attend.
It is something into which we are drawn.
As the Church teaches, the liturgy is the work of Christ and His Body, the Church.
So the next time you attend Mass and wonder:
“Why do we do that?”
There is a good chance that somewhere in the Church’s liturgical books, there is an answer.
And when we understand the answer, we can stop seeing Mass as a collection of unfamiliar actions and begin seeing the beautiful order behind them.
The GIRM helps us understand not only what happens at Mass, but why the Church celebrates the Mass the way she does.
REFLECTION
The next time you attend Mass, try something different.
Don’t simply watch what is happening.
Pay attention.
Listen to the words.
Notice the gestures.
Observe the moments of silence.
Understand the movements.
Join the responses.
Sing when it is time to sing.
Kneel when it is time to kneel.
And when the Eucharistic Prayer begins, remember that you are not an audience member watching something happen at the altar.
You are part of the worshipping Church.
The more we understand the liturgy, the more consciously we can enter into it.
And the more consciously we enter into it, the more deeply we can encounter the Christ who is at its centre.
SOURCES
📖 Sacred Scripture: 1 Corinthians 10:16–17; 1 Corinthians 12:12–27; Ephesians 5:19; Colossians 3:16; Luke 4:16–21.
📜 General Instruction of the Roman Missal (GIRM): especially nos. 16–45 on the nature and importance of the celebration of Mass; nos. 73–90 on the structure of the Mass; nos. 274–287 on gestures, posture and reverence; and the relevant sections concerning the ministries, sacred space, music and liturgical celebrations.
⛪ Second Vatican Council, Sacrosanctum Concilium: especially nos. 7, 14, 22, 26–31, 33 and 48, on the nature of the liturgy, active participation, liturgical authority, the roles of the faithful and ministers, Sacred Scripture and participation in the Eucharistic celebration.
📚 Catechism of the Catholic Church: especially CCC 1066–1075 on the liturgy as the work of Christ; CCC 1145–1155 on signs, symbols, words and actions; and CCC 1187–1199 on the liturgical celebration.
Be Prayerful. Be Inspired.
©Catholic Dailies
