Part I-A.The Liturgy is Public Worship

13. It is unquestionably the fundamental duty of man to orientate his person and his life towards God. "For He it is to whom we must first be bound, as to an unfailing principle; to whom even our free choice must be directed as to an ultimate objective. It is He, too, whom we lose when carelessly we sin. It is He whom we must recover by our faith and trust."[10] But man turns properly to God when he acknowledges His Supreme majesty and supreme authority; when he accepts divinely revealed truths with a submissive mind; when he scrupulously obeys divine law, centering in God his every act and aspiration; when he accords, in short, due worship to the One True God by practicing the virtue of religion .

14. This duty is incumbent, first of all, on men as individuals. But it also binds the whole community of human beings, grouped together by mutual social ties: mankind, too, depends on the sovereign authority of God.

15. It should be noted, moreover, that men are bound by his obligation in a special way in virtue of the fact that God has raised them to the supernatural order.

16. Thus we observe that when God institutes the Old Law, He makes provision besides for sacred rites, and determines in exact detail the rules to be observed by His people in rendering Him the worship He ordains. To this end He established various kinds of sacrifice and designated the ceremonies with which they were to be offered to Him. His enactments on all matters relating to the Ark of the Covenant, the Temple and the holy days are minute and clear. He established a sacerdotal tribe with its high priest, selected and described the vestments with which the sacred ministers were to be clothed, and every function in any way pertaining to divine worship.[11] Yet this was nothing more than a faint foreshadowing [12] of the worship which the High Priest of the New Testament was to render to the Father in heaven.

17. No sooner, in fact, "is the Word made flesh"[13] than he shows Himself to the world vested with a priestly office, making to the Eternal Father an act of submission which will continue uninterruptedly as long as He lives: "When He cometh into the world he saith. . . 'behold I come . . . to do Thy Will."[14] This act He was to consummate admirably in the bloody Sacrifice of the Cross: "It is in this will we are sanctified by the oblation of the Body of Jesus Christ once."[15] He plans His active life among men with no other purpose in view. As a child He is presented to the Lord in the Temple. To the Temple He returns as a grown boy, and often afterwards to instruct the people and to pray. He fasts for forty days before beginning His public ministry. His counsel and example summon all to prayer, daily and at night as well. As Teacher of the truth He "enlighteneth every man"[16] to the end that mortals may duly acknowledge the immortal God, "not withdrawing unto perdition, but faithful to the saving of the soul."[17] As Shepherd He watches over His flock, leads it to life-giving pasture, lays down a law that none shall wander from His side, off the straight path He has pointed out, and that all shall lead holy lives imbued with His spirit and moved by His active aid. At the Last Supper He celebrates a new Pasch with solemn rite and ceremonial, and provides for its continuance through the divine institution of the Eucharist. On the morrow, lifted up between heaven and earth, He offers the saving sacrifice of His life, and pours forth, as it were, from His pierced Heart the sacraments destined to impart the treasures of redemption to the souls of men. All this He does with but a single aim: the glory of His Father and man's ever greater sanctification.

18. But it is His will, besides, that the worship He instituted and practiced during His life on earth shall continue ever afterwards without intermission. For he has not left mankind an orphan. He still offers us the support of His powerful, unfailing intercession, acting as our "advocate with the Father."[18] He aids us likewise through His Church, where He is present indefectibly as the ages run their course: through the Church which He constituted "the pillar of truth"[19] and dispenser of grace, and which by His sacrifice on the cross, He founded, consecrated and confirmed forever.[20]

19. The Church has, therefore, in common with the Word Incarnate the aim, the obligation and the function of teaching all men the truth, of governing and directing them aright, of offering to God the pleasing and acceptable sacrifice; in this way the Church re-establishes between the Creator and His creatures that unity and harmony to which the Apostle of the Gentiles alludes in these words: "Now, therefore, you are no more strangers and foreigners; but you are fellow citizens with the saints and domestics of God, built upon the foundation of the apostles and prophets, Jesus Christ Himself being the chief corner-stone; in whom all the building, being framed together, groweth up into a holy temple in the Lord, in whom you also are built together in a habitation of God in the Spirit."[21] Thus the society founded by the divine Redeemer, whether in her doctrine and government, or in the sacrifice and sacraments instituted by Him, or finally, in the ministry, which He has confided to her charge with the outpouring of His prayer and the shedding of His blood, has no other goal or purpose than to increase ever in strength and unity.

20. This result is, in fact, achieved when Christ lives and thrives, as it were, in the hearts of men, and when men's hearts in turn are fashioned and expanded as though by Christ. This makes it possible for the sacred temple, where the Divine Majesty receives the acceptable worship which His law prescribes, to increase and prosper day by day in this land of exile of earth. Along with the Church, therefore, her Divine Founder is present at every liturgical function: Christ is present at the august sacrifice of the altar both in the person of His minister and above all under the eucharistic species. He is present in the sacraments, infusing into them the power which makes them ready instruments of sanctification. He is present, finally, in prayer of praise and petition we direct to God, as it is written: "Where there are two or three gathered together in My Name, there am I in the midst of them."[22] The sacred liturgy is, consequently, the public worship which our Redeemer as Head of the Church renders to the Father, as well as the worship which the community of the faithful renders to its Founder, and through Him to the heavenly Father. It is, in short, the worship rendered by the Mystical Body of Christ in the entirety of its Head and members.

21. Liturgical practice begins with the very founding of the Church. The first Christians, in fact, "were persevering in the doctrine of the apostles and in the communication of the breaking of bread and in prayers."[23] Whenever their pastors can summon a little group of the faithful together, they set up an altar on which they proceed to offer the sacrifice, and around which are ranged all the other rites appropriate for the saving of souls and for the honor due to God. Among these latter rites, the first place is reserved for the sacraments, namely, the seven principal founts of salvation. There follows the celebration of the divine praises in which the faithful also join, obeying the behest of the Apostle Paul, "In all wisdom, teaching and admonishing one another in psalms, hymns and spiritual canticles, singing in grace in your hearts to God."[24] Next comes the reading of the Law, the prophets, the gospel and the apostolic epistles; and last of all the homily or sermon in which the official head of the congregation recalls and explains the practical bearing of the commandments of the divine Master and the chief events of His life, combining instruction with appropriate exhortation and illustration of the benefit of all his listeners.

22. As circumstances and the needs of Christians warrant, public worship is organized, developed and enriched by new rites, ceremonies and regulations, always with the single end in view, "that we may use these external signs to keep us alert, learn from them what distance we have come along the road, and by them be heartened to go on further with more eager step; for the effect will be more precious the warmer the affection which precedes it."[25] Here then is a better and more suitable way to raise the heart to God. Thenceforth the priesthood of Jesus Christ is a living and continuous reality through all the ages to the end of time, since the liturgy is nothing more nor less than the exercise of this priestly function. Like her divine Head, the Church is forever present in the midst of her children. She aids and exhorts them to holiness, so that they may one day return to the Father in heaven clothed in that beauteous raiment of the supernatural. To all who are born to life on earth she gives a second, supernatural kind of birth. She arms them with the Holy Spirit for the struggle against the implacable enemy. She gathers all Christians about her altars, inviting and urging them repeatedly to take part in the celebration of the Mass, feeding them with the Bread of angels to make them ever stronger. She purifies and consoles the hearts that sin has wounded and soiled. Solemnly she consecrates those whom God has called to the priestly ministry. She fortifies with new gifts of grace the chaste nuptials of those who are destined to found and bring up a Christian family. When as last she has soothed and refreshed the closing hours of this earthly life by holy Viaticum and extreme unction, with the utmost affection she accompanies the mortal remains of her children to the grave, lays them reverently to rest, and confides them to the protection of the cross, against the day when they will triumph over death and rise again. She has a further solemn blessing and invocation for those of her children who dedicate themselves to the service of God in the life of religious perfection. Finally, she extends to the souls in purgatory, who implore her intercession and her prayers, the helping hand which may lead them happily at last to eternal blessedness in heaven.