Whether craftiness is a special sin?

Objections

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.