The Liturgy of the Hours or Divine Office is the official set of aily prayers prescribed by the church to be recited at the canonical hours by the clergy, religious orders, and laity. The Liturgy of the Hours consists primarily of psalms supplemented by hymns and readings. Together with the Mass, it constitutes the official public prayer life of the church. Upon ordination to any of the Holy Orders, the daily recitation of the Liturgy of the Hours becomes a canonical obligation. The Liturgy of the Hours also forms the basis of prayer within Christian monasticism.