Catechism of the Catholic Church

308 Part Two assembly, the day of the Christian family, and the day of joy and rest from work. Sunday is “the foundation and kernel of the whole liturgical year” ( SC 106). 1194 The Church, “in the course of the year, . . . unfolds the whole mystery of Christ from his Incarnation and Nativity through his Ascension, to Pentecost and the expectation of the blessed hope of the coming of the Lord” ( SC 102 § 2). 1195 By keeping the memorials of the saints—first of all the holy Mother of God, then the apostles, the martyrs, and other saints—on fixed days of the liturgical year, the Church on earth shows that she is united with the liturgy of heaven. She gives glory to Christ for having accomplished his salvation in his glorified members; their example encourages her on her way to the Father. 1196 The faithful who celebrate the Liturgy of the Hours are united to Christ our high priest, by the prayer of the Psalms, meditation on the Word of God, and canticles and blessings, in order to be joined with his unceasing and universal prayer that gives glory to the Father and implores the gift of the Holy Spirit on the whole world. 1197 Christ is the true temple of God, “the place where his glory dwells”; by the grace of God, Christians also become temples of the Holy Spirit, living stones out of which the Church is built. 1198 In its earthly state the Church needs places where the community can gather together. Our visible churches, holy places, are images of the holy city, the heavenly Jerusalem, toward which we are making our way on pilgrimage. 1199 It is in these churches that the Church celebrates public worship to the glory of the Holy Trinity, hears the word of God and sings his praise, lifts up her prayer, and offers the sacrifice of Christ sacramentally present in the midst of the assembly. These churches are also places of recollection and personal prayer.