52 Of course, the most excellent prayer of all is the one offered daily at the altar by Christ Jesus, the High Priest, to God the Father when the holy sacrifice of Redemption is renewed. Accordingly, let many Masses be offered for the sacred missions, especially in this our time on which the future growth of the Church in many areas is perhaps dependent. This is in accordance with the prayers of our Lord Who loves His Church and wishes her to flourish and enlarge her borders throughout the whole world.
Source: Fidei Donum (Vatican.va)