37 Considering their special designation to perform the liturgical functions of the holy sacrifice and divine office, the Church has serious reason for prescribing that the ministers she assigns to the service of the sanctuary and members of religious institutes betake themselves at stated times to mental prayer, to examination of conscience, and to various other spiritual exercises. Unquestionably, liturgical prayer, being the public supplication of the illustrious Spouse of Jesus Christ, is superior in excellence to private prayers. But this superior worth does not at all imply contrast or incompatibility between these two kinds of prayer. For both merge harmoniously in the single spirit which animates them, "Christ is all and in all." Both tend to the same objective: until Christ be formed in us.
Source: Mediator Dei (Vatican.va)