8 But that decay of faith in divine things of which We have spoken is the effect not only of pride, but also of moral corruption. For if it is true that a strict morality improves the quickness of man's intellectual powers, and if on the other hand, as the maxims of pagan philosophy and the admonitions of divine wisdom combine to teach us, the keenness of the mind is blunted by bodily pleasures, how much more, in the region of revealed truths, do these same pleasures obscure the light of faith, or even, by the just judgment of God, entirely extinguish it. For these pleasures at the present day an insatiable appetite rages, infecting all classes as with an infectious disease, even from tender years. Yet even for so terrible an evil there is a remedy close at hand in the divine Eucharist. For in the first place it puts a check on lust by increasing charity, according to the words of St. Augustine, who says, speaking of charity, "As it grows, lust diminishes; when it reaches perfection, lust is no more" ( De diversis quaestionibus , lxxxiii., q. 36). Moreover the most chaste flesh of Jesus keeps down the rebellion of our flesh, as St. Cyril of Alexandria taught, "For Christ abiding in us lulls to sleep the law of the flesh which rages in our members" (Lib. iv., c. ii., in Joan ., vi., 57). Then too the special and most pleasant fruit of the Eucharist is that which is signified in the words of the prophet: "What is the good thing of Him," that is, of Christ, "and what is His beautiful thing, but the corn of the elect and the wine that engendereth virgins" (Zach. ix., 17), producing, in other words, that flower and fruitage of a strong and constant purpose of virginity which, even in an age enervated by luxury, is daily multiplied and spread abroad in the Catholic Church, with those advantages to religion and to human society, wherever it is found, which are plain to see.
Source: Mirae Caritatis (Vatican.va)