19 Both these heresies are fathered by the "enemy" who "sowed weeds among the wheat" in order to bring about the downfall of mankind. Both revolts go about in the hidden ways of darkness, develop along the same line, and come to an end in the same fatal way. In the past the first apostasy turned where fortune seemed to smile. It set rulers against people or people against rulers only to lead both classes to destruction. Today this modern apostasy stirs up hatred between the poor and the rich until, dissatisfied with their station, they gradually fall into such wretched ways that they must pay the fine imposed on those who, absorbed in worldly, temporal things, forget "the kingdom of God and His justice." As a matter of fact, this present conflict is even more serious than the others. Although the wild innovators of former times generally preserved some fragments of the treasury of revealed doctrine, these moderns act as if they will not rest until they completely destroy it. When the foundations of religion are overthrown, the restraints of civil society are also necessarily shattered. Behold the sad spectacle of our times! Behold the impending danger of the future! However, it is no danger to the Church, for the divine promise leaves no room for doubt. Rather, this revolution threatens the family and nations, especially those who actively stir up or indifferently tolerate this unhealthy atmosphere of irreligion.
Source: Editae Saepe (Vatican.va)