There is nothing more injurious to chastity than the excessive use of wine, in which, as the Apostle says, there is luxury. (Cf. Eph. 5:18), It is at all times the capital enemy of this angelic virtue; but it is particularly in youth that such indulgence is most fatal. . Hence St. Jerome says that wine and youth are two incentives to impurity. (Ad Eustoch, de Cust. Virg.). Wine is to youth what fuel is to fire. As oil poured upon the flames only increases their intensity, so wine, like a violent conflagration, heats the blood, enkindling and exciting the passions to the highest pitch of folly and madness. Witness the excesses into which man is led by hatred, love, revenge, and other passions, when stimulated by intoxicating liquors. The natural effect of this fatal indulgence is to counteract all the results of the moral virtues. These subdue and control the baser passions, but wine excites and urges them to the wildest licentiousness. Judge, therefore, with what vigilance you should guard against the attacks of such an enemy.
--Louis de Granada, The Sinner's Guide
