Whether craftiness is a special sin?
Objection 1: It would seem that craftiness is not a special sin. For the words of Holy Writ do not induce anyone to sin; and yet they induce us to be crafty, according to Prov. 1:4, "To give craftiness [Douay: 'subtlety'] to little ones." Therefore craftiness is not a sin.
Objection 2: Further, it is written (Prov. 13:16): "The crafty [Douay: 'prudent'] man doth all things with counsel." Therefore, he does so either for a good or for an evil end. If for a good end, there is no sin seemingly, and if for an evil end, it would seem to pertain to carnal or worldly prudence. Therefore craftiness is not a special sin distinct from prudence of the flesh.
Objection 3: Further, Gregory expounding the words of Job 12, "The simplicity of the just man is laughed to scorn," says (Moral. x, 29): "The wisdom of this world is to hide one's thoughts by artifice, to conceal one's meaning by words, to represent error as truth, to make out the truth to be false," and further on he adds: "This prudence is acquired by the young, it is learnt at a price by children." Now the above things seem to belong to craftiness. Therefore craftiness is not distinct from carnal or worldly prudence, and consequently it seems not to be a special sin.
On the contrary, The Apostle says (2 Cor. 4:2): "We renounce the hidden things of dishonesty, not walking in craftiness, nor adulterating the word of God." Therefore craftiness is a sin.
I answer that, Prudence is "right reason applied to action," just as science is "right reason applied to knowledge." In speculative matters one may sin against rectitude of knowledge in two ways: in one way when the reason is led to a false conclusion that appears to be true; in another way when the reason proceeds from false premises, that appear to be true, either to a true or to a false conclusion. Even so a sin may be against prudence, through having some resemblance thereto, in two ways. First, when the purpose of the reason is directed to an end which is good not in truth but in appearance, and this pertains to prudence of the flesh; secondly, when, in order to obtain a certain end, whether good or evil, a man uses means that are not true but fictitious and counterfeit, and this belongs to the sin of craftiness. This is consequently a sin opposed to prudence, and distinct from prudence of the flesh.
Reply to Objection 1: As Augustine observes (Contra Julian. iv, 3) just as prudence is sometimes improperly taken in a bad sense, so is craftiness sometimes taken in a good sense, and this on account of their mutual resemblance. Properly speaking, however, craftiness is taken in a bad sense, as the Philosopher states in Ethic. vi, 12.
Reply to Objection 2: Craftiness can take counsel both for a good end and for an evil end: nor should a good end be pursued by means that are false and counterfeit but by such as are true. Hence craftiness is a sin if it be directed to a good end.
Reply to Objection 3: Under "worldly prudence" Gregory included everything that can pertain to false prudence, so that it comprises craftiness also.
II–II · Q. 55, Art. 4: Whether guile is a sin pertaining to craftiness?
Whether guile is a sin pertaining to craftiness?
Objection 1: It would seem that guile is not a sin pertaining to craftiness. For sin, especially mortal, has no place in perfect men. Yet a certain guile is to be found in them, according to 2 Cor. 12:16, "Being crafty I caught you by guile." Therefore guile is not always a sin.
Objection 2: Further, guile seems to pertain chiefly to the tongue, according to Ps. 5:11, "They dealt deceitfully with their tongues." Now craftiness like prudence is in the very act of reason. Therefore guile does not pertain to craftiness.
Objection 3: Further, it is written (Prov. 12:20): "Guile [Douay: 'Deceit'] is in the heart of them that think evil things." But the thought of evil things does not always pertain to craftiness. Therefore guile does not seem to belong to craftiness.
On the contrary, Craftiness aims at lying in wait, according to Eph. 4:14, "By cunning craftiness by which they lie in wait to deceive": and guile aims at this also. Therefore guile pertains to craftiness.
I answer that, As stated above (A 3), it belongs to craftiness to adopt ways that are not true but counterfeit and apparently true, in order to attain some end either good or evil. Now the adopting of such ways may be subjected to a twofold consideration; first, as regards the process of thinking them out, and this belongs properly to craftiness, even as thinking out right ways to a due end belongs to prudence. Secondly the adopting of such like ways may be considered with regard to their actual execution, and in this way it belongs to guile. Hence guile denotes a certain execution of craftiness, and accordingly belongs thereto.
Reply to Objection 1: Just as craftiness is taken properly in a bad sense, and improperly in a good sense, so too is guile which is the execution of craftiness.
Reply to Objection 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 to Objection 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.