2 But the boldness of these bad men, which day by day more and more threatens civil society with destruction, and strikes the souls of all with anxiety and fear, finds its cause and origin in those poisonous doctrines which, spread abroad in former times among the people, like evil seed bore in due time such fatal fruit. For you know, venerable brethren, that that most deadly war which from the sixteenth century down has been waged by innovators against the Catholic faith, and which has grown in intensity up to today, had for its object to subvert all revelation, and overthrow the supernatural order, that thus the way might be opened for the discoveries, or rather the hallucinations, of reason alone. This kind of error, which falsely usurps to itself the name of reason, as it lures and whets the natural appetite that is in man of excelling, and gives loose rein to unlawful desires of every kind, has easily penetrated not only the minds of a great multitude of men but to a wide extent civil society, also. Hence, by a new species of impiety, unheard of even among the heathen nations, states have been constituted without any count at all of God or of the order established by him; it has been given out that public authority neither derives its principles, nor its majesty, nor its power of governing from God, but rather from the multitude, which, thinking itself absolved from all divine sanction, bows only to such laws as it shall have made at its own will. The supernatural truths of faith having been assailed and cast out as though hostile to reason, the very Author and Redeemer of the human race has been slowly and little by little banished from the universities, the lyceums and gymnasia-in a word, from every public institution. In fine, the rewards and punishments of a future and eternal life having been handed over to oblivion, the ardent desire of happiness has been limited to the bounds of the present. Such doctrines as these having been scattered far and wide, so great a license of thought and action having sprung up on all sides, it is no matter for surprise that men of the lowest class, weary of their wretched home or workshop, are eager to attack the homes and fortunes of the rich; it is no matter for surprise that already there exists no sense of security either in public or private life, and that the human race should have advanced to the very verge of final dissolution.
Source: Quod Apostolici Muneris (Vatican.va)