30 Whatever the future may be, in this grave and widespread evil it is Our duty, venerable brethren, to endeavour to find a remedy. And because We know that Our best and firmest hope of a remedy is in the power of that divine religion which the Freemasons hate in proportion to their fear of it, We think it to be of chief importance to call that most saving power to Our aid against the common enemy. Therefore, whatsoever the Roman Pontiffs Our predecessors have decreed for the purpose of opposing the undertakings and endeavours of the masonic sect, and whatsoever they have enacted to enter or withdraw men from societies of this kind, We ratify and confirm it all by our apostolic authority: and trusting greatly to the good will of Christians, We pray and beseech each one, for the sake of his eternal salvation, to be most conscientiously careful not in the least to depart from what the apostolic see has commanded in this matter.
Source: Humanum Genus (Vatican.va)