3 Now, the source of these evils lies chiefly, We are convinced, in this, that the holy and venerable authority of the Church, which in God's name rules mankind, upholding and defending all lawful authority, has been despised and set aside. The enemies of public order, being fully aware of this, have thought nothing better suited to destroy the foundations of society than to make an unflagging attack upon the Church of God, to bring her into discredit and odium by spreading infamous calumnies and accusing her of being opposed to genuine progress. They labor to weaken her influence and power by wounds daily inflicted, and to overthrow the authority of the Bishop of Rome, in whom the abiding and unchangeable principles of right and good find their earthly guardian and champion. From these causes have originated laws that shake the structure of the Catholic Church, the enacting whereof we have to deplore in so many lands; hence, too, have floured forth contempt of episcopal authority; the obstacles thrown in the way of the discharge of ecclesiastical duties; the dissolution of religious bodies; and the confiscation of property that was once the support of the Church's ministers and of the poor. Thereby, public institutions, vowed to charity and benevolence, have been withdrawn from the wholesome control of the Church; thence, also, has arisen that unchecked freedom to teach and spread abroad all mischievous principles, while the Church's claim to train and educate youth is in every way outraged and baffled. Such, too, is the purpose of the seizing of the temporal power, conferred many centuries ago by Divine Providence on the Bishop of Rome, that he might without let or hindrance use the authority conferred by Christ for the eternal welfare of the nations.(2)
Source: Inscrutabili Dei Consilio (Vatican.va)