56 Tell, therefore, your clergy, Venerable Brothers, whom We know have labored so devotedly in these different fields of activity for the Church of Christ, and whose work We have seen at close range and have even participated in and which We appreciate so highly, tell them that when they co-operate with you, they are united with Christ and guided by Him through you; that at the same time they also co-operate with Us, and that We bless them with Our fatherly blessing.
Source: Ubi Arcano Dei Consilio (Vatican.va)