216 Here is a spectacle for all the world to see: thousands of Our sons and brothers, whom We love so dearly, suffering years of bitter persecution in many lands, even those of an ancient Christian culture. And will not men who see clearly and compare the superior dignity of the persecuted with that refined barbarity of their oppressors, soon return to their senses, if indeed they have not already done so?
Source: Mater et Magistra (Vatican.va)