Humanum Genus §8

⁸ For these reasons We no sooner came to the helm of the Church than We clearly saw and felt it to be Our duty to use Our authority to the very utmost against so vast an evil. We have several times already, as occasion served, attacked certain chief points of teaching which showed in a special manner the perverse influence of Masonic opinions. Thus, in Our encyclical letter, Quod Apostolici Muneris , We endeavoured to refute the monstrous doctrines of the socialists and communists; afterwards, in another beginning " Arcanum ," We took pains to defend and explain the true and genuine idea of domestic life, of which marriage is the spring and origin; and again, in that which begins '' Diuturnum ,"(11) We described the ideal of political government conformed to the principles of Christian wisdom, which is marvellously in harmony, on the one hand, with the natural order of things, and, in the other, with the well-being of both sovereign princes and of nations. It is now Our intention, following the example of Our predecessors, directly to treat of the masonic society itself, of its whole teaching, of its aims, and of its manner of thinking and acting, in order to bring more and more into the light its power for evil, and to do what We can to arrest the contagion of this fatal plague.