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Ĭelebration of the Divine Office is an obligation undertaken by priests and deacons intending to become priests, while deacons intending to remain deacons are obliged to recite only a part. The recitation of the Divine Office also forms the basis of prayer within Christian monasticism, with many orders producing their own permutations of the Liturgy of the Hours and older Roman Breviary. Together with the Mass, it constitutes the official public prayer life of the Church. The Liturgy of the Hours, like many other forms of the canonical hours, consists primarily of psalms supplemented by hymns, readings, and other prayers and antiphons prayed at fixed prayer times. Before 1971, the official form for the Latin Church was the Breviarium Romanum, first published in 1568 with major editions through 1962. The Liturgy of the Hours forms the official set of prayers "marking the hours of each day and sanctifying the day with prayer." The term "Liturgy of the Hours" has been retroactively applied to the practices of saying the canonical hours in both the Christian East and West prior to the Second Vatican Council, and is the official term for the canonical hours promulgated for usage by the Latin Church in 1971. The Liturgy of the Hours ( Latin: Liturgia Horarum) or Divine Office (Latin: Officium Divinum) or Work of God (Latin: Opus Dei) are the canonical hours, often also referred to as the breviary, of the Latin rites of the Catholic Church. Benedictine monks singing vespers, which is part of the Liturgy of the Hours