22 The clergy have imitated the truly wonderful example of constancy given them by the Bishops and have themselves in turn given no less brilliant an example of fortitude through all the tedious changes of the great conflict. This example of extraordinary virtue on their part has been a great comfort to Us. We have made it known to the whole Catholic world and We praise them because "they are worthy." ( Apoc . iii, 4) And in this special context, when We recall that every imaginable artifice was employed, that all the power and vexatious tactics of our adversaries had but one purpose, to alienate both the clergy and people from their allegiance to the hierarchy and to this Apostolic See, and that despite all this only one or two priests, from among the four thousand, betrayed in a shameful manner their holy office, it certainly seems to Us that there is nothing which We cannot hope for from the Mexican clergy.
Source: Iniquis Afflictisque (Vatican.va)