purity are but a small evil. Like ” the sow wallowing in the mire" ("Sus lota in volutabro luti" - 2 Pet. ii. 22), they are immersed in their own filth, so that they do not see the malice of their actions; and therefore they neither feel nor abhor the stench of their impurities, which excite disgust and horror in all others. Can you, who say that the vice of impurity is but a small evil can you, I ask, deny that it is a mortal sin? If you deny it, you are a heretic; for as St. Paul says: "Do not err. Neither fornicators, nor adulterers, nor the effeminate, etc., shall possess the kingdom of God." (1 Cor. vi. 9.) It is a mortal sin; it cannot be a small evil. It is more sinful than theft, or detraction, or the violation of the fast. How then can you say that it is not a great evil? Perhaps mortal sin appears to you to be a small evil? Is it a small evil to despise the grace of God, to turn your back upon him, and to lose his friendship, for a transitory, beastly pleasure?
2. St. Thomas teaches, that mortal sin, because it is an insult offered to an infinite God, contains a certain infinitude of malice. "A sin committed against God has a certain infinitude, on account of the infinitude of the Divine Majesty." (S. Thom., 3 p., q. 1, art. 2, ad. 2.) Is mortal sin a small evil? It is so great an evil, that if all the angels and all the saints, the apostles, martyrs, and even the Mother of God, offered all their merits to atone for a single mortal sin, the oblation would not be sufficient. No; for that atonement or satisfaction would be finite; but the debt contracted by mortal sin is infinite, on account of the infinite Majesty of God which has been offended. The hatred which God bears to sins against purity is great beyond measure. If a lady find her plate soiled she is disgusted, and cannot eat. Now, with what disgust and indignation must God, who is Purity itself, behold the filthy impurities by which his law is violated? He loves purity with an infinite love; and consequently he has an infinite hatred for the sensuality which the lewd, voluptuous man calls a small evil. Even the devils who held a high rank in heaven before their fall disdain to tempt men to sins of the flesh.
3. St. Thomas says (lib. 5, de Erud. Princ., c. li.)
