3 When We recall these things, Our soul is filled with joy. To you and to the people of Hungary, We gladly pay the tribute of praise for things well done. - But We cannot remain silent. Everyone knows how inimical to virtue these times are and how the Church is attacked. We have much to fear amid such dangers, lest a shaken faith languish even where it has taken strong and deep roots. It is enough to recall rationalism and naturalism, those deadly sources of evil whose teachings are everywhere freely distributed. We must then add the many allurements to corruption: the opposition to or open defection from the Church by public officials, the bold obstinacy of secret societies, here and there a curriculum for the education of youth without regard for God. - And if ever, then surely now is the time to realize not only how appropriate, but entirely necessary the Catholic religion is for public safety and tranquility. Daily experience proves to what lengths they who fear no authority nor have ever restrained their passions will go to undermine the state. Indeed, everyone knows what they intend, what means they employ, and with what perseverance they labor. The mightiest empires and the most flourishing states are compelled to contend almost every hour with such societies of men, joined together in unity of intention and likeness of deeds. Thus, the public safety is always in danger. Against such audacity of evil men, a good plan has been perfected in some places, that the authority of magistrates and the force of laws be well prepared.
Source: Quod Multum (Vatican.va)