138 The ideal of Christian life is that each one be united to God in the closest and most intimate manner. For this reason, the worship that the Church renders to God, and which is based especially on the eucharistic sacrifice and the use of the sacraments, is directed and arranged in such a way that it embraces by means of the divine office, the hours of the day, the weeks and the whole cycle of the year, and reaches all the aspects and phases of human life.
Source: Mediator Dei (Vatican.va)