20 Moreover, human nature was stained by original sin, and is therefore more disposed to vice than to virtue. For a virtuous life it is absolutely necessary to restrain the disorderly movements of the soul, and to make the passions obedient to reason. In this conflict human things must very often be despised, and the greatest labors and hardships must be undergone, in order that reason may always hold its sway. But the naturalists and Freemasons, having no faith in those things which we have learned by the revelation of God, deny that our first parents sinned, and consequently think that free will is not at all weakened and inclined to evil.(13) On the contrary, exaggerating rather the power and the excellence of nature, and placing therein alone the principle and rule of justice, they cannot even imagine that there is any need at all of a constant struggle and a perfect steadfastness to overcome the violence and rule of our passions. Wherefore we see that men are publicly tempted by the many allurements of pleasure; that there are journals and pamphlets with neither moderation nor shame; that stage-plays are remarkable for license; that designs for works of art are shamelessly sought in the laws of a so called verism; that the contrivances of a soft and delicate life are most carefully devised; and that all the blandishments of pleasure are diligently sought out by which virtue may be lulled to sleep. Wickedly, also, but at the same time quite consistently, do those act who do away with the expectation of the joys of heaven, and bring down all happiness to the level of mortality, and, as it were, sink it in the earth. Of what We have said the following fact, astonishing not so much in itself as in its open expression, may serve as a confirmation. For, since generally no one is accustomed to obey crafty and clever men so submissively as those whose soul is weakened and broken down by the domination of the passions, there have been in the sect of the Freemasons some who have plainly determined and proposed that, artfully and of set purpose, the multitude should be satiated with a boundless license of vice, as, when this had been done, it would easily come under their power and authority for any acts of daring.
Source: Humanum Genus (Vatican.va)