From his marvelous encyclical, Praeclara gratulationis:
There is likewise a great danger threatening unity on the part of that association which goes by the name of Freemasons, whose fatal influence for a long time past oppresses Catholic nations in particular. Favored by the agitations of the times, and waxing insolent in its power and resources and success, it strains every nerve to consolidate its sway and enlarge its sphere. It has already sallied forth from its hiding-places, where it hatched its plots, into the throng of cities, and as if to defy the Almighty, has set up its throne in this very city of Rome, the Capital of the Catholic world. But what is most disastrous is, that wherever it has set its foot it penetrates into all ranks and departments of the commonwealth, in the hope of obtaining at last supreme control. This is, indeed, a great calamity: for its depraved principles and iniquitous designs are well known. Under the pretence of vindicating the rights of man and of reconstituting society, it attacks Christianity; it rejects revealed Doctrine, denounces practices of Piety, the Divine Sacraments, and every Sacred thing as superstition; it strives to eliminate the Christian Character from Marriage and the family and the education of youth, and from every form of instruction, whether public or private, and to root out from the minds of men all respect for Authority, whether human or Divine. On its own part, it preaches the worship of nature, and maintains that by the principles of nature are truth and probity and justice to be measured and regulated. In this way, as is quite evident, man is being driven to adopt customs and habits of life akin to those of the heathen, only more corrupt in proportion as the incentives to sin are more numerous.
My, how successful the Freemasons have been. It is a call for one to plead to the Lord: “How Long, O Lord? Will you ever relent with your anger? How long will you allow sowing of confusion and despair, the worship of man and nature, ignorance of the Gospel, a chokehold on preaching? You proved the divine appointment of your Church for 2000 years. Now, will you abandon her? Tear open the heavens and come down from your mighty throne. Rescue the poor and wandering fold, lost and without guidance.”