Sin: Always a folly

 “David, the royal prophet, the conqueror of Goliath, himself conquered by sensuality, and from adulterer become a murderer, at last felt the crushing weight of his double crime, and exclaimed: I do beseech thee, O Lord, take away the iniquity of thy servant, for I have done foolishly! (1 Chronicles 21:8)

Sin is always a folly, and a weakness, no matter what kind it may be, or who he be that commits it. The rebel angel, or fallen man may, in their pride, make efforts to persuade themselves that, when they sinned, they did not act as fools, and were not weak; but all their efforts are vain; sin must ever have this disgrace upon it, that it is folly and weakness, for it is a revolt against God, a contempt for his law, a mad act of the creature who, being made by his Creator to attain infinite happiness and glory, prefers to debase himself by turning towards nothingness, and then falls even lower than the nothingness from which he was taken. 

It is, however, a folly that is voluntary, and a weakness that has no excuse; for although the creature has nothing of his own but darkness and misery, yet his infinitely merciful Creator, by means of his grace, which is never wanting, puts within that creature’s reach divine strength and light”

[culled from the Lit. Yr]

Be reminded: "The crowning disloyalty to God is heresy. It is the sin of sins, the very loathsomest of things which God looks down upon in this malignant world. Yet how little do we understand of its excessive hatefulness! It is the polluting of God’s truth, which is the worst of all impurities" Fr. Faber.

And, modernism, promoted by Bergoglio a.k.a "Pope Francis" and his cohorts, is the "synthesis of all heresies"