10 It is a great consolation to Us to know that the number of missionary vocations is happily on the increase at the present time and promises well for the Church; still very much remains to be done; there is still much need of prayer. When We consider the countless peoples who are to be called to the one fold and to the one haven of salvation by the preaching of these missionaries, We address to the heavenly Prince of Pastors the words of Ecclesiasticus: "For as thou hast been sanctified in us in their sight, so thou shalt be magnified among them in our presence, that they may know thee, as we also have known thee. that there is no God beside thee. O Lord."
Source: Evangelii Praecones (Vatican.va)