76. With its weekly recurrence, the Lord's Day is rooted in the most ancient tradition of the Church and is vitally important for the Christian. But there was another rhythm which soon established itself:the annual liturgical cycle. Human psychology in fact desires the celebration of anniversaries, associating the return of dates and seasons with the remembrance of past events. When these events are decisive in the life of a people, their celebration generally creates a festive atmosphere which breaks the monotony of daily routine.
Now, by God's design, the great saving events upon which the Church's life is founded were closely linked to the annual Jewish feasts of Passover and Pentecost, and were prophetically foreshadowed in them.
77. A similar commemorative logic guided the arrangement of the entire Liturgical Year. As the Second Vatican Council recalls, the Church wished to extend throughout the year "the entire mystery of Christ, from the Incarnation and Nativity to the Ascension, to the day of Pentecost and to the waiting in blessed hope for the return of the Lord. Remembering in this way the mysteries of redemption, the Church opens to the faithful the treasury of the Lord's power and merits, making them present in some sense to all times, so that the faithful may approach them and be filled by them with the grace of salvation". (121)
After Easter and Pentecost, the most solemn celebration is undoubtedly the Nativity of the Lord, when Christians ponder the mystery of the Incarnation and contemplate the Word of God who deigns to assume our humanity in order to give us a share in his divinity.78. Likewise, "in celebrating this annual cycle of the mysteries of Christ, the holy Church venerates with special love the Blessed Virgin Mary, Mother of God, united forever with the saving work of her Son". (122) In a similar way, by inserting into the annual cycle the commemoration of the martyrs and other saints on the occasion of their anniversaries, "the Church proclaims the Easter mystery of the saints who suffered with Christ and with him are now glorified". (123) When celebrated in the true spirit of the liturgy, the commemoration of the saints does not obscure the centrality of Christ, but on the contrary extols it, demonstrating as it does the power of the redemption wrought by him. As Saint Paulinus of Nola sings, "all things pass, but the glory of the saints endures in Christ, who renews all things, while he himself remains unchanged". (124) The intrinsic relationship between the glory of the saints and that of Christ is built into the very arrangement of the Liturgical Year, and is expressed most eloquently in the fundamental and sovereign character of Sunday as the Lord's Day. Following the seasons of the Liturgical Year in the Sunday observance which structures it from beginning to end, the ecclesial and spiritual commitment of Christians comes to be profoundly anchored in Christ, in whom believers find their reason for living and from whom they draw sustenance and inspiration.
79. Sunday emerges therefore as the natural model for understanding and celebrating these feast-days of the Liturgical Year, which are of such value for the Christian life that the Church has chosen to emphasize their importance by making it obligatory for the faithful to attend Mass and to observe a time of rest, even though these feast-days may fall on variable days of the week. (125) Their number has been changed from time to time, taking into account social and economic conditions, as also how firmly they are established in tradition, and how well they are supported by civil legislation. (126)
The present canonical and liturgical provisions allow each Episcopal Conference, because of particular circumstances in one country or another, to reduce the list of Holy Days of obligation. Any decision in this regard needs to receive the special approval of the Apostolic See, (127) and in such cases the celebration of a mystery of the Lord, such as the Epiphany, the Ascension or the Solemnity of the Body and Blood of Christ, must be transferred to Sunday, in accordance with liturgical norms, so that the faithful are not denied the chance to meditate upon the mystery. (128) Pastors should also take care to encourage the faithful to attend Mass on other important feast-days celebrated during the week. (129)
80. There is a need for special pastoral attention to the many situations where there is a risk that the popular and cultural traditions of a region may intrude upon the celebration of Sundays and other liturgical feast-days, mingling the spirit of genuine Christian faith with elements which are foreign to it and may distort it. In such cases, catechesis and well-chosen pastoral initiatives need to clarify these situations, eliminating all that is incompatible with the Gospel of Christ. At the same time, it should not be forgotten that these traditions — and, by analogy, some recent cultural initiatives in civil society — often embody values which are not difficult to integrate with the demands of faith. It rests with the discernment of Pastors to preserve the genuine values found in the culture of a particular social context and especially in popular piety, so that liturgical celebration — above all on Sundays and holy days — does not suffer but rather may actually benefit. (130)
