For thy mouth uttereth thine iniquity, and thou choosest the tongue of the crafty. For thy mouth uttereth - In attempting to justify thyself, thou hast added iniquity to sin, and hast endeavored to impute blame to thy Maker.
The tongue of the crafty - Thou hast varnished thy own conduct, and used sophistical arguments to defend thyself. Thou resemblest those cunning persons, ערומים arumim, who derive their skill and dexterity from the old serpent, "the nachash, who was ערום arum, subtle, or crafty, beyond all the beasts of the field;" Genesis 3:1. Thy wisdom is not from above, but from beneath.