A tongue bent like a bow is a chilling image, because it names deceit as a trained skill rather than a stumble. These are people who have practiced the lie until aiming it feels natural, and each falsehood loads the next. That is the mechanism of corruption. You do not fall into the abyss in one leap; you proceed from evil to evil, one small betrayal of truth at a time.
Courage for the truth is rarer than we admit, because the truth exposes you and costs you standing. To refuse that courage is to lose contact with reality itself, which is what it means to know not God.