Reply Obj. 2: The execution of craftiness with the purpose of deceiving, is effected first and foremost by words, which hold the chief place among those signs whereby a man signifies something to another man, as Augustine states (De Doctr. Christ. ii, 3), hence guile is ascribed chiefly to speech. Yet guile may happen also in deeds, according to Ps. 104:25, "And to deal deceitfully with his servants." Guile is also in the heart, according to Ecclus. 19:23, "His interior is full of deceit," but this is to devise deceits, according to Ps. 37:13: "They studied deceits all the day long."
Reply Obj. 3: Whoever purposes to do some evil deed, must needs devise certain ways of attaining his purpose, and for the most part he devises deceitful ways, whereby the more easily to obtain his end. Nevertheless it happens sometimes that evil is done openly and by violence without craftiness and guile; but as this is more difficult, it is of less frequent occurrence. _______________________
FIFTH ARTICLE [II-II, Q. 55, Art. 5]
Whether Fraud Pertains to Craftiness?
Objection 1: It would seem that fraud does not pertain to craftiness. For a man does not deserve praise if he allows himself to be deceived, which is the object of craftiness; and yet a man deserves praise for allowing himself to be defrauded, according to 1 Cor. 6:1, "Why do you not rather suffer yourselves to be defrauded?" Therefore fraud does not belong to craftiness.
Obj. 2: Further, fraud seems to consist in unlawfully taking or receiving external things, for it is written (Acts 5:1) that "a certain man named Ananias with Saphira his wife, sold a piece of land, and by fraud kept back part of the price of the land." Now it pertains to injustice or illiberality to take possession of or retain external things unjustly. Therefore fraud does not belong to craftiness which is opposed to prudence.
Obj. 3: Further, no man employs craftiness against himself. But the frauds of some are against themselves, for it is written (Prov. 1:18) concerning some "that they practice frauds [Douay: 'deceits'] against their own souls." Therefore fraud does not belong to craftiness.
On the contrary, The object of fraud is to deceive, according to Job 13:9, "Shall he be deceived as a man, with your fraudulent [Douay: 'deceitful'] dealings?" Now craftiness is directed to the same object. Therefore fraud pertains to craftiness.
I answer that, Just as guile consists in the execution of craftiness, so also does fraud. But they seem to differ in the fact that guile belongs in general to the execution of craftiness, whether this be effected by words, or by deeds, whereas fraud belongs more properly to the execution of craftiness by deeds.
Reply Obj. 1: The Apostle does not counsel the faithful to be deceived in their knowledge, but to bear patiently the effect of being deceived, and to endure wrongs inflicted on them by fraud.