109 These heralds of the gospel dedicate and consecrate their lives to God in order that the light of Jesus Christ may enlighten every man who comes into the world, (55) that the grace of God may enter and support every soul, and that all men may be aroused to a life that is good, honorable, and Christian. These men seek not their own interests, but those of Jesus Christ. (56) They have answered with generosity the call of their Divine Redeemer and can apply to themselves the words of the Apostle of the Gentiles: "On behalf of Christ . . . we are acting as ambassadors,'' (57) and "though we walk in the flesh, we do not make war according to the flesh.'' (58) They regard as a second fatherland and love with an active charity the land to which they have come to bring the light of the Gospel's truth. Although they will always have deep affection for their native land and their diocese or religious institute, they regard it as clear and certain that the good of the universal Church must be preferred and they must give it their first and wholehearted service.
Source: Ad Petri Cathedram (Vatican.va)