Liturgy of the Hours

The Liturgy of the Hours (Latin: Liturgia Horarum), also known as the Divine Office (Latin: Divinum Officium) or Opus Dei, meaning 'Work of God,' is the official collection of prayers of the Latin Church that marks and sanctifies the hours of each day. Consisting primarily of psalms supplemented by hymns, Scripture readings, and other prayers and antiphons recited or chanted at fixed times, it forms, together with the Mass, the public prayer of the Church. The present official form of the entire Liturgy of the Hours of the Roman Rite is contained in the four-volume Latin-language publication Liturgia Horarum, the first edition of which appeared in 1971. The term 'Liturgy of the Hours' has been applied retroactively to canonical hour practices in both the Christian East and West prior to the Second Vatican Council, though 1971 marks its formal promulgation for the Latin Church under that name. Prior to 1971, the official form for the Latin Church was the Breviarium Romanum, first published in 1568, with major editions continuing through 1962.

The practice of praying at fixed hours of the day has deep roots across Christian traditions. The canonical hours as formalized in the Latin Church found their classical expression in the Breviarium Romanum, which appeared in its first printed form in 1568 and underwent major revisions across subsequent centuries up to 1962. Monastic and mendicant orders developed their own permutations of the Divine Office, and the chanting or recitation of the Office has long formed the foundation of prayer within the consecrated life. Following the Second Vatican Council, a comprehensive revision resulted in the promulgation of the Liturgia Horarum, published in Latin in 1971. Vernacular translations quickly followed: for Catholics in primarily Commonwealth nations, the three-volume Divine Office was published in 1974, drawing on a range of English Bible translations for its Scripture readings. The four-volume Liturgy of the Hours, with Scripture readings from the New American Bible, appeared in 1975 with approval from the United States Conference of Catholic Bishops. Canonical hour practices are also observed in the Christian East and in several other Western traditions, including Eastern Catholic, Eastern Orthodox, Oriental Orthodox, Anglican, Lutheran, and some other Protestant communities, each celebrating them in various forms and under various names.

Within the Latin Church, the Liturgy of the Hours holds a distinctive place as one of the two pillars of the Church's official public prayer, the other being the Mass. Prayer of the Divine Office is an obligation undertaken by priests and by deacons intending to become priests, while deacons intending to remain permanent deacons are obliged to recite only a part of it. The constitutions of religious institutes generally bind their members to celebrate at least portions of the Hours and in some cases require this to be done communally, in choir. Consecrated virgins assume the duty to celebrate the Liturgy of the Hours as part of their rite of consecration. The faithful of the Latin Church are encouraged to recite the Divine Office, whether together with priests, among themselves, or individually, though no general obligation falls upon them; the laity may, however, take on such an obligation through a personal vow. The centrality of psalmody to the Hours reflects a pattern of prayer that unites Scripture with structured liturgical time, and the entire cycle of psalms, hymns, and readings is ordered to the sanctification of the day. The 1989 English translation of the Ceremonial of Bishops includes instructions on the Liturgy of the Hours presided over by a bishop, including the celebration of Vespers on major solemnities.

The Liturgy of the Hours stands as a living expression of continuous liturgical development spanning centuries of Christian worship. The post-conciliar reform embodied in the 1971 Liturgia Horarum represented a significant restructuring of the older Roman Breviary, making the Hours more accessible to clergy, religious, and laity alike. The swift production of vernacular translations in the years immediately following 1971 — including the Commonwealth Divine Office of 1974 and the American Liturgy of the Hours of 1975 — demonstrated the broad scope of the reform's reach across the Latin Church. The tradition of the Divine Office as Opus Dei, the 'Work of God,' has continued to animate monastic life, with various orders maintaining their own forms alongside the reformed rite. Across both Eastern and Western Christianity, the practice of sanctifying the hours of the day through structured prayer remains a shared heritage, even as the particular forms differ considerably by tradition. Within the Latin Church, the Hours continue to serve as a daily rhythm of prayer binding clergy, religious, and engaged laity to a common liturgical cycle rooted in the Psalms and the broader canon of Scripture.