135 We give Our paternal approval to the competent and effective work of those priests who have become voluntary emigrants out of love for Jesus Christ and in obedience to the instructions and wishes of this Apostolic See. These priests have spared no effort to ascertain and serve, so far as they can, the social and spiritual needs of their flocks. Thus, wherever the emigrant may journey, he sees the Church's love for him and discovers that this love is even more evident and more effective when his need for care and aid is greatest.
Source: Ad Petri Cathedram (Vatican.va)