Romans 3:18

The beneficent action of the law, the apostle showed in the passage relating to the Jews, writing thus: “Behold, thou art called a Jew and restest in the law, and makest thy boast in God, and knowest the will of God, and approvest the things that are more excellent, being instructed out of the law, and art confident that thou thyself art a guide of the blind, a light of them who are in darkness, an instructor of the foolish, a teacher of babes, who hast the form of knowledge and of truth in the law.” For it is admitted that such is the power of the law, although those whose conduct is not according to the law, make a false pretence, as if they lived in the law. …

8. Hence the threatening countenance, the lowering aspect, pallor in the face, trembling on the lips, gnashing of the teeth, mad words, unbridled revilings, a hand prompt for the violence of slaughter; even if for the time deprived of a sword, yet armed with the hatred of an infuriate mind. And accordingly the Holy Spirit says in the Psalms: “Be not jealous against him who walketh prosperously in his way.” And again: “The wicked shall observe the righteous, and shall gnash upon him with his teeth. But God shall laugh at him; for He seeth that his day is coming.” The blessed Apostle Paul designates and points out these when he says, “The poison of asps is under their lips, and their mouth is full of cursing and bitterness. Their feet are swift to shed blood, destruction and misery are in their ways, who have not known the way of peace; neither is the fear of God before their eyes.”