Jesus Christ Himself offered the first Eucharistic Sacrifice in the Supper Room of Jerusalem, and this in close connection with the eating of the Paschal Lamb of the Old Testament.

At the same time He ordered the celebration of this Sacrifice in His Church for all times, when He gave to the Apostles and their successors in the priestly office the command and the power to do the same as He had done. After the example and by the order of Christ, the Apostles celebrated everywhere on their missionary journeys the Eucharistic Sacrifice.
In all probability they did not celebrate it for the first time previous to Whitsunday, but they most likely did so on that grand day, when the Holy Ghost descended on the infant Church; this view is made evident by the fact that the Holy Ghost performs forever the mystery of the Consecration as He once did the mystery of the Incarnation.

 
 

 Christ's example was the norm for the Apostles; at the celebration of the Sacrifice they did, first, only that which Christ had done before. According to His directions and under the inspiration of the Holy Ghost they observed other things besides, namely, according to circumstances of time and place, to the simple, essential act of sacrifice they added various prayers and observances, in order to celebrate the Holy Mysteries as worthily and as edifyingly as possible. Those constituent portions of the sacrificial rite, which are found in all the ancient liturgies, have incontestably their origin from Apostolic times and tradition; such, for example, as the preparatory prayers, the readings from Holy Scripture, the Psalms, the offering of bread and wine mixed with water, the supplications for the living and the dead, the Offertory prayers and the words added to those of the Consecration, the reference to the death and resurrection of Christ, the Lord's Prayer, the sign of the Cross, the kiss of peace, the fraction and distribution of the Host, the thanksgiving after Communion. The Apostles, who had been instructed by the Lord Himself in the mysteries of the kingdom of God, and were filled with the Holy Ghost, assuredly observed a fixed order in the daily celebration of the Holy Sacrifice, although they did not establish and bequeath a written liturgy. 2

The first offering of the Holy Sacrifice by our Lord was the rule and the model for the Apostles; and the essential and fundamental features of the sacrificial rite, introduced and enlarged upon by the Apostles, were preserved with fidelity and reverence in the churches founded by them and their successors; but in the course of time, according as it was deemed necessary or expedient, it was always more and more developed, enriched and perfected, yet after a different manner, in the various churches of the East and West. ' 'The Lord never ceases to be present to His beloved Spouse the Church, never fails to be at her side in her office of teaching and to accompany her in her operation with His blessing," consequently, He had the power, as He also had the will, to bequeath to the chiefs and shepherds of the Church the right to give to the Sacrifice instituted by Himself the most natural and the wisest development and the best adapted form, that is, to give it due liturgical form and solemnity.

 Thus there originated in different places, at different times and among different nations also different liturgies, that is, ecclesiastical formulas for the celebration of the Eucharistic Sacrifice. In the main features, in the essential points of the Sacrifice, all these various rites of the Mass agree; but in the rest they all differ more or less, both in substance as well as in construction. 1 With regard to their origin and their affinity, they may be divided into different classes; in general they are divided into two extensive groups the liturgies of the East and the liturgies of the West. This division is warranted and well grounded, for the Eastern liturgies are characteristically distinguished from those of the West, not only by reason of their country and language, but also because of their spirit, contents and form. The liturgies of the East have a more stable, unchangeable character, since the same divine praises, the same petitions and thanksgivings are nearly always repeated; they present very little variety in the daily celebration of the ecclesiastical year. The liturgies of the West, on the contrary, exhibit a greater variety, fresh life and constant progress, for the celebration of the ecclesiastical feasts and seasons is most intimately connected and interwoven with the Holy Sacrifice. While the Oriental liturgies, for the most part, contain more lengthy prayers, a greater abundance of symbolical customs and acts, the Western, and especially the Roman-Latin rite, is marked by a significant brevity, as well as by a dignified simplicity and a marvellous sublimity in word and action.

 3. While the liturgies of the East are very numerous, there are but few in the West. The principal are the Mozarabic, the ancient Gallic, the Ambrosian 1 and Roman liturgies. The last named has at all times had the precedence, and is now found in all parts of the world. Already Pope Innocent I. (402 417)? in writing to Decentius, Bishop of Gubbio, about ritual matters, traces the origin of the Roman liturgy to the Prince of the Apostles: "Who does not know," he writes, "that what has been handed down by Peter, the Prince of the Apostles, to the Roman Church is still observed unto this day, and must be observed by all?" St. Peter, consequently, must be regarded (in a more general sense) as the founder of the Roman liturgy, for the method of celebration followed and introduced by him 1 was, without doubt, the essential and permanent foundation for its later development and form. "This liturgy, as yet a tender plant, was brought by St. Peter, the Prince of the Church, into the garden of the Roman Church, where by his nursing care and that of his successors, assisted by the Holy Ghost, it has grown to a large tree, and although the trunk has long ago attained its full growth, it nevertheless shoots forth in every century new branches and new blossoms" (Kossing). The most ancient written inventories of the Roman liturgy we possess in three Sacramentaries, which bear the names of Pope Leo I. (440 461), Gelasius I. (492 496) and Gregory I. (590 604) ( Sacramentarium Leonianum, Gelasianum, Gregorianum) . 2 These Sacramentaries contain a precious treasure of liturgical traditions, which date from the most ancient period of the Roman Church. The above named Popes deserve well of the liturgy, inasmuch as they faithfully preserved the ancient formulas, and, at the same time, enriched and perfected them with additions suitable to the times. Our Missal is principally derived from the Sacrameutary of St. Gregory the Great. Under him the Canon of the Mass received its last addition. The rest of the constituent parts of the Roman liturgy of the Mass (the Introit, the Kyrie, the Gloria, the Collect, the Epistle, the Gradual, the Gospel, the Secreta, the Preface, the Pater Noster, the Communion and the Post-Communion) date back at least to the fifth or even the fourth century. Toward the close of the Middle Age the Missals were much disfigured by particular changes and unsuitable additions, so that there was urgent need of a reform. This was accomplished under the Popes Pius V. (1560 1572), Clement VIII. (1592 1605) and Urban VIII. (1623 1644), who carefully revised and corrected the Missal. 1 Thus the Gregorian Rite was, as far as possible, restored to its original purity, simplicity and dignity, while at the same time the desired unity of divine worship was brought about.

 4. Thus has the Church in the course of time set the jewel of the Holy Sacrifice in the most magnificent manner with heavenly wisdom and skill for the praise of God and the edification of the faithful, by surrounding it with the precious decorations of holy prayers, of holy hymns, lessons and ceremonies. 2

She has enveloped the celebration of the adorable Sacrifice in a mystic veil, in order to fill the hearts and minds of the faithful with religious awe and profound reverence, and to urge them to earnest, pious contemplation and meditation. The beauty, the worth and the perfection of the Roman liturgy of the Mass are universally acknowledged and admired. Father Faber styles the Church's Rite of the Holy Sacrifice "the most beautiful thing this side of heaven," and, as he remarks, "it came forth out of the grand mind of the Church, and lifted us out of earth and out of self, and wrapped us round in a cloud of mystical sweetness and the sublimities of a more than angelic liturgy, and purified us almost without ourselves, and charmed us with celestial charming, so that our very senses seem to find vision, hearing, fragrance, taste and touch, beyond what earth can give." The Church prayers of the liturgy are superior to all other prayers; no "human genius can hope to attain their beauty and sublimity. In these two qualities, the Mass differs from all other offices in a remarkable manner. It has not merely flights of eloquence and poetry strikingly displayed in particular prayers, but it is sustained throughout in the higher sphere, to which its divine purpose naturally raises it. If we examine each prayer separately, it is perfect; perfect in construction, perfect in thought, and perfect in expression. If we consider the manner in which they are brought together, we are struck with the brevity of each, with the sudden but beautiful transitions, and the almost stanza-like effect, with which they succeed one another, forming a lyrical composition of surpassing beauty. If we take the entire service, as a whole, it is constructed with the most admirable symmetry, proportioned in its parts with perfect judgment and so exquisitely arranged, as to excite and preserve an unbroken interest in the sacred action. No doubt, to give full force and value to this sacred rite, its entire ceremonial is to be considered. The assistants, with their noble vestments, the chant, the incense, the more varied ceremonies which belong to a solemn Mass, are all calculated to increase veneration and admiration. But still, the essential beauties remain, whether the holy rite be performed under the golden vault of St. Peter's, with all the pomp and circumstance befitting its celebration by the Sovereign Pontiff, or in a wretched wigwam, erected in haste by some poor savages for their missionary" (Wiseman). "That overruling influence of the Spirit of God, that directs even in secondary matters the affairs of the visible Church, nowhere else appears so marked and evident as in the arrangement of the rite of the Holy Mass, which, although only monumental, yet in its present state forms such a beautiful, perfect whole, yea, a splendid work, that it excites the admiration of every reflecting mind. Even the bitterest adversaries of the Church do not deny it; unprejudiced, aesthetic judges of good taste admit that even from their own standpoint the Mass is to be classed as one of the greatest masterpieces ever composed. Thus the momentous sacrifice is encompassed with magnificent ceremonies : it is our duty to study to penetrate more and more into their meaning, and to expound what we have learned to the people according to their capacity" (Oswald). The Roman liturgy has for some centuries been a complete masterpiece of art, wonderful in the harmony and union of its parts. The most sacred and venerable prayers and chants, breathing religious fervor and tenderness, follow most ingeniously upon one another, and together with the most appropriate and significant actions and ceremonies, form a beautiful whole, serving as a protecting garment and a worthy ornament to the divine mystery of the Holy Sacrifice. Their language, for its kind and object, cannot be surpassed; 1 for it is biblical, ancient, simple, grave, dignified, solid, full of the spirit of faith, humility and devotion, and penetrated with the perfume of piety and holiness. 5.

This glorious rite of the Sacrifice of the Mass is an unfailing mine of religious instruction and edification; it is like an immensely rich mine, where always new gold veins are disclosed to the searching look. Even if we were to devote our entire life to considering in our meditations and prayers the mystical liturgy of the Mass, there would still remain for our heart and mind new treasures, still new riches would reveal themselves and new beauties would be disclosed. And yet though it be so deep and impenetrable as to prove inexhaustible to even the greatest contemplative saint, it is, at the same time, so clear and easy of comprehension, that the most artless child as well as the most simple of the faithful finds therein light, incentive, strength and nourishment for his religious life. But is this precious liturgical treasure valued and turned to good account, as it deserves to be, by the ministers of the Church, in other words, do they study it for their own sanctification and make it available to the faithful in the school, in catechetical instructions and sermons ?" 2

"The liturgy is a constant mysterious sermon, but it is by the mouth of the priest that the laity must learn to understand its language. Without liturgical instruction the participation of the faithful in the functions of divine worship will be in many instances only external and mechanical. The mighty stream of the ecclesiastical year flows by, the faithful stand on its bank, they look on, and of its waters they receive but a few drops which the waves of themselves cast upon the shore" (Amberger).

 In order to discover the true and full meaning of the rite of the Mass, we must view it from the proper standpoint, and be guided by those correct maxims which give the sense of the liturgical words and actions. 1 It is self-evident that that unecclesiastical view is to be rejected which, while discarding all the higher and mystical sense, seeks to explain the mysterious liturgy after a mere natural or historic manner, by trying to ascribe all ceremonies exclusively to reasons of necessity, expedience and propriety. 2 Yet, on the other hand, in the mystical explanation of the liturgy the opposite mistake is to be avoided, which consists in giving arbitrary explanations without regard to the intentions of the Church, and in indulging in silly trifles and affected subtleties. 3

The Church herself applies symbolical meanings in her liturgy; therefore, in explaining the liturgy we must, above all things, attend to what the Church would express by her ceremonies. 4 "Since by reason of his nature man is so constituted that without exterior aid he cannot easily rise to the contemplation of divine things, the Church, as a devoted Mother, has, therefore, introduced into her liturgy certain usages, as, for example, that some portions of the Mass should be recited in a low tone, others in a loud tone of voice. In like manner certain ceremonies, for instance, the mystical blessings, the use of lights, incense, vestments and many things of that nature, she employs by Apostolic prescription and tradition, in order both to manifest thereby the majesty of the great Sacrifice, as well as to animate the minds of the faithful by these visible signs of religion and piety to the consideration of the sublime mysteries hidden within this Sacrifice." 5

 

  The ceremonies of the liturgy of the Mass, accordingly, have in general for their purpose a twofold object : in the first place they are intended to enhance and adorn the celebration of Mass, to serve for the honor and the worship of God; then, too, they are designed as a means to place before the eyes of the faithful in a lively manner the sublimity, the holiness and the efficacy of the Sacrifice, that the faithful, being thereby moved to sentiments of devotion, may be better disposed in heart to glorify God and to obtain grace. Now the honor of God and the sanctification of man invariably constitute the principal object of all liturgical acts, and this, consequently, in their explanation must be always kept in the foreground; whatever is instructive therein is merely subordinate, and should be made to serve the main object. 1

The different ceremonies may, according to their object and signification, be more succinctly grouped into three classes. 2

 a) All the ceremonies of Mass conduce to the order, beauty and adornment of divine worship. Now while some ceremonies, nay, even many, have yet a higher mystical meaning, others are prescribed merely to invest the celebration of divine worship with decorum, dignity and reverence. The latter ceremonies are based merely on a just regard to propriety, decorum and suitableness. To this class belongs, for example, the prescription that the priest approach the altar with downcast eyes and measured step; that he place the left hand on his breast when making the sign of the Cross; that he turn toward the faithful, when greeting or blessing them. 3

 b) Most of the ceremonies are outward forms of worship, that is, they are the outcome of an interior emotion, expressions of religious thought and sentiments. 4 Among these are the different positions and movements of the body, of the members of the body, for example, the bending of the knee, the striking of the breast, the bowing of the body and the head, the raising up and the joining of the hands. Such acts are outward signs which express, accompany and awaken devout sentiments of the heart; for instance, sentiments of adoration, humility, desire, sorrow and confidence. "They who pray, bend the knee, raise the hands or prostrate themselves to the ground, thereby expressing outwardly what they feel inwardly. Their invisible will and the intention of their heart is indeed known to God, and their interior sentiments need not be made known to Him by such signs; but by their means we are to pray and sigh more humbly and more ardently; and although these bodily motions are made through a previous impulse of the heart, nevertheless, the emotion of the heart is, I know not how, again increased by these exterior signs, which it had produced, and the interior devotion, which preceded them, grows more intense through the exterior devotion which it had brought forth." 1

 c) A third group is prescribed especially because of their symbolical signification; these ceremonies are destined prominently to indicate the mysteries of Christian faith and life. 2

To this class, for example, belong the mixing of wine and water, the washing of the hands at the Offertory, the placing of the hands over the oblation before the Consecration, the breaking of the Host and the dropping of a small particle of it into the chalice, the frequent making of the sign of the Cross, the use of lights and incense.

 Accordingly the ceremonies of the liturgy in the intention of the Church serve not merely for the proper, the worthy and the edifying celebration of the Sacrifice, but also for the exterior honor of God, of the Eucharistic Saviour, of the saints, of relics and pictures, as well as for the symbolical expression of the different mysteries. These different objects do not exclude one another, but are often united together in one and the same liturgical act, for example, sometimes in the use of the sign of the Cross, the honor paid the Cross. Along with the natural reason and object of a ceremony the Church not unfrequently combines a higher, mystical sense. 3 Finally, we must not overlook in the ceremonies their sacramental character, which consists in this that they in their own way produce spiritual effects and obtain divine grace.

 6. Catholic ceremonies, therefore, are not the relics of heathen or Jewish customs, but Apostolic and ecclesiastical ordinances, forms of worship created and pervaded by a higher spirit. Consequently, the priest should highly esteem and love them, and therefore perform them with punctuality and dignity. St. Teresa was ready to sacrifice her life for even the least ceremony of the Church. In the service of the Almighty, in the most Holy Sacrifice of the Mass even the smallest thing has its meaning and importance; and, therefore, the Church has so exactly and minutely regulated by her rubrics the entire deportment of the priest at the altar. Whosoever conscientiously complies with these ecclesiastical regulations, has the special merit of practising the virtue of obedience in all his actions and movements when celebrating. To all applies the admonition of the Apostle: "Glorify and bear God in your body!" (i Cor. 6, 20.)

 The Council of Trent gives this Admonition:

1 Tanta gravitate, tanto religionis cultu (sacerdotes) Missae sacrificium celebrent, ut per visibilem ministri pietatem invisibilia aeterni sacerdotis mysteria conspiciantur. Nihil igitur obiter in hac divina actione, nihil perfunctorie, nihil praecipitanter, nihil inconditis gestibus, omnia vero graviter, otnnia secundum ordinem fiant, juxta receptos et approbates Ecclesiae ritus, qui vel in minimis sine peccato negligi, omitti vel mutari baud possunt (Concil. prov. Quebec. II, a. 1854).

 A modest demeanor and a becoming exterior, regulated according to the requirements of reason and faith, honors God, edifies our neighbor and promotes our own spiritual life. Therefore, the priest at the altar should, above all, not neglect the exterior. In his whole deportment should be reflected his faith, his reverence, his recollection of mind, his heartfelt devotion. 1 "What great care is to be taken to celebrate Holy Mass with all religious solemnity and devotion, every one will easily understand, when he reflects that in Holy Scripture a curse is pronounced upon those who do the work of God negligently. 2

Since we must confess that the faithful can perform no action so holy and so divine as this adorable mystery, in which that life-giving Victim, which has reconciled us with God the Father, is daily offered by the priest on the altar. It is, then, selfevident that all pains and care should be taken to perform this Sacrifice with the greatest purity of heart and with all the marks of exterior devotion and piety." 1 The priest at the altar should render to God in the name of the Church a homage of the highest veneration: in the first place, interiorly by acts of faith, of hope, love, humility, contrition, praise, thanksgiving and petition; then also exteriorly by bows, by genuflections, by striking his breast, raising his hands and eyes, kissing the altar and many other ceremonies. 2 All these acts should be performed with devotion, reverence and dignity in the presence of God and of His holy angels, otherwise they become occasions of distraction, of scandal and of all manner of irreverence.