“Take, eat; this IS my body.” Mt 26:26

I believe that we live in an age where fallen-away Catholics don’t really know what they’ve left, non-Catholics don’t really know what they’re missing, and many Catholics don’t really know what they’ve got. They don’t really know the Mass.
The Mass is the climactic form of Christian worship and within it is contained the greatest miracle on earth. It is a mystery in the fullest sense, and yet, it is comprehensible. As Christians we possess faith, but do we possess understanding? Do we even seek it? I know personally that my understanding of the Mass and what happens during it is inexcusably deficient, mostly from neglect. But I (and you) can change this — and it begins here.
I want to help change your next Mass experience, by the grace of God. So I’ve compiled a list of 7 interesting facts about the Mass, each with a brief explanation. I hope you learn something new!

1. The Mark of the Christian
The Sign of the Cross that marks the beginning and end of the Holy Mass, and which signifies the sealing of the Word of God “in our minds, on our lips and in our hearts” at the reading of the Gospel, has its origin in the first centuries of Christianity.
Tertullian wrote in the mid-3rd century:
“In all our travels and movements, in all our coming in and going out, in putting on our shoes, at the bath, at the table, in lighting our candles, in lying down, in sitting down, whatever employment occupies us, we mark our foreheads with the sign of the cross” (De corona, 30).
The sign of the cross, done by faith, has immense power. St. Benedict once did the sign of the cross over a poisoned drink meant to kill him, and as his hand moved reverently through the four directions of the cross, the glass shattered. What would have happened if he had been insincere, or worse, not blessed his food and drink at all with the sacred sign? God only knows.
Each sign of the cross is also a sign —a renewal even — of one’s personal decision to accept Christ as Lord and Savior. How many times have we gone through the “motion of the cross” instead of the “sign of the cross”?

2. “And With Your Spirit”
When the Christian people respond “and with your spirit” to the priest’s greeting (“The Lord be with you”) in the Holy Mass, it is not just a polite (and somewhat odd) response. It is a profession of faith in the power of the Sacrament of Holy Orders. It recognizes the unique action of the Holy Spirit in the ordained priest, particularly in the Sacraments. Remember, for example, it is not the priest who changes the bread and wine into the body and blood of Christ — it is Jesus Christ. Thus, the priest receives the power to serve as a special instrument of the Holy Spirit at his ordination; that is, when he receives the Sacrament of Holy Orders through the “laying on of hands” (see 1 Tim 4:14; 2 Tim 1:6).
Here’s what the 4th century bishop, St. John Crysostom,wrote about these words and their meaning:
“If the Holy Spirit were not in this your common father and teacher, you would not, just now, when he ascended this holy chair and wished you all peace, have cried out with one accord, ‘And with your spirit.’
Thus you cry out to him, not only when he ascends his throne and when he speaks to you and prays for you, but also when he stands at this holy altar to offer the sacrifice. He does not touch that which lies on the altar before wishing you the grace of our Lord, and before you have replied to him, ‘And with your spirit.’
By this cry, you are reminded that he who stands at the altar does nothing, and that the gifts that repose there are not the merits of a man; but that the grace of the Holy Spirit is present and, descending on all, accomplishes this mysterious sacrifice. We indeed see a man, but it is God who acts through him. Nothing human takes place at this holy altar.”

3. Kiss of the Priest
The priest kisses the altar in veneration, recognizing it as the sacred place where Christ’s once and for all sacrifice will be made present in the Sacrament of the Eucharist. Jesus’s death is re-presented in the Holy Mass as a celebration of the New Covenant Passover, just as the Old Covenant Passover was made present each year it was celebrated (see Ex 12:27). St. Paul contrasts the Eucharistic sacrifice to the pagan sacrifice in 1 Cor 11. Jesus is therefore not re-sacrificed at each Mass but rather, His one sacrifice becomes present to us as He is eternally presenting Himself to God as the sacrificial Lamb of God (Heb 7:25; 1 Cor 5:7; 1 Cor 11:26; Rev 5:6).
Around 70 A.D. Church leaders wrote this about the Eucharistic sacrifice (the Mass):
“Assemble on the Lord’s day, and break bread and offer the Eucharist; but first make confession of your faults, so that your sacrifice may be a pure one. Anyone who has a difference with his fellow is not to take part with you until he has been reconciled, so as to avoid any profanation of your sacrifice [Matt. 5:23–24]. For this is the offering of which the Lord has said, ‘Everywhere and always bring me a sacrifice that is undefiled, for I am a great king, says the Lord, and my name is the wonder of nations’ [Mal. 1:11, 14]” (Didache 14 [A.D. 70]).

4. What’s Inside the Altar?
Did you know that many Catholic altars have a relic placed inside?
Father Carlos Martins, CC, of Treasures of the Church describes relics in this way:
Relics are physical objects that have a direct association with the saints or with Our Lord. They are usually broken down into three classes. First class relics are the body or fragments of the body of a saint, such as pieces of bone or flesh. Second class relics are something that a saint personally owned, such as a shirt or book (or fragments of those items). Third class relics are those items that a saint touched or that have been touched to a first, second, or another third class relic of a saint.
The General Instruction of the Roman Missal, No. 302, contains the following statement:
“The practice of placing relics of Saints, even those not Martyrs, under the altar to be dedicated is fittingly retained. Care should be taken, however, to ensure the authenticity of such relics.”

The bones of St. Polycarp of Smyrna (a disciple of John the beloved apostle) were venerated in the early Church, for example:
“We took up his bones, which are more valuable than precious stones and finer than refined gold, and laid them in a suitable place, where the Lord will permit us to gather ourselves together, as we are able, in gladness and joy and to celebrate the birthday of his martyrdom” (The Martyrdom of Polycarp [A.D 156])
For more, I also discuss relics in this recent article.

5. Cross or Crucifix?
A cross with a figure of Christ crucified must be present on or near the altar. This is mandated by the Church. A bare cross or a cross with Jesus depicted in a non-crucified way (like the modern “resurrected” Christ portrayal which has become more common) does not meet this requirement. Like St. Paul in his first letter to the Church in Corinth, we preach Christ crucified as an ultimate sign of God’s love for us and the salvation won for us through His crucifixion:
“we preach Christ crucified, a stumbling block to Jews and folly to Gentiles” (1 Cor 1:23; see also 2:2)
The crucifix, properly understood, is not an image of a mere gory execution; rather, it is a sign of the once for all sacrifice of the Lamb of God (1 Cor 5:7).
The General Instruction for the Roman Missal states:
There is also to be a cross, with the figure of Christ crucified upon it, either on the altar or near it, where it is clearly visible to the assembled congregation. It is appropriate that such a cross, which calls to mind for the faithful the saving Passion of the Lord, remain near the altar even outside of liturgical celebrations (GIRM 308).

6. Sit, Stand, Kneel and Bow
A genuflection before the Jesus in the tabernacle is not meant to be a purely physical action. It requires a simultaneous “bow of the heart.”
The venerable practice of genuflecting before the Blessed Sacrament, whether enclosed in the tabernacle or publicly exposed, as a sign of adoration, is to be maintained. This act requires that it be performed in a recollected way. In order that the heart may bow before God in profound reverence, the genuflection must be neither hurried nor careless (Inaestimabile Donum 26).
Some people may wonder what’s up with Catholics and all the bowing, standing, sitting, kneeling that they do in the Mass. It’s a good and honest question. Catholics assume these gestures because of who and what they are encountering in the Mass — the King of Kings and His Word. In the case of veneration with the body, the body leads the heart.
Consider these words from C.S. Lewis’s Screwtape Letters:
“At the very least, they can be persuaded that the bodily position makes no difference to their prayers; for they constantly forget, what you must always remember, that they are animals and that whatever their bodies do affects their souls” (Letter IV).
Our postures matter, especially in the Mass — the climax of Christian Worship. As King David writes in this beautiful Psalm:
“O come, let us worship and bow down, let us kneel before the Lord, our Maker! For he is our God…” (Psalm 95)

7. The Fraction Rite
After the consecration (when the bread and wine are changed into the body and blood of Jesus) but before Communion, the priest breaks off a piece of his “big” host and adds it to the precious blood (which still maintains the physical properties of wine). This breaking and commingling of the broken piece of the Body with the Blood is rich in significance:
First, it is not a separating of Christ, as though a “part” of Christ is here and a “part” of Christ is there. In each molecule of the consecrated host, the resurrected Christ is totally and perfectly present in His infinite divine substance.
Second, this “breaking”, called the “Fraction Rite”, follows Christ’s breaking of bread at the Last Supper and is rich in biblical significance (Luke 22:19; Acts 2:42, 46; 1 Cor 10:16).
Third, the commingling of the broken fraction with the blood in the chalice symbolizes the reunification of Christ’s body and blood in his glorious resurrection.
Now here’s an interesting tidbit to end off this post:
Originally, this Fraction rite and commingling had another important significance. At each Mass, the priest would break off a piece of the host (as he does now) but then, that consecrated fraction would be sent to another celebration of the Eucharist at another location. There, the fraction sent from the parish “down the road” would be commingled with the blood of Christ. The fraction of the host from that Mass would then be sent off to another Mass, and so on. This ritual created a great sense of unity among the faithful in the Mass, and signified the continuity of the eucharistic sacrifice in the Church (Mal 1:11; 1 Cor 10:17). This practice was known as fermentum, but has fallen out of practice in modern times.
If you would like to read more about the specifics of the Mass I highly recommend Mass Revision by Jimmy Akin to get you started.
See you in the Eucharist!

Visit Matt Nelson at Reasonable Catholic