Psalms 36:3

The words of his mouth are iniquity and deceit. This pair of hell dogs generally hunt together, and what one does not catch the other will; if iniquity cannot win by oppression, deceit will gain by chicanery. When the heart is so corrupt as to flatter itself, the tongue follows suit. The open sepulchre of the throat reveals the foulness of the inner nature. God fearing men make a conscience of their words, and if they sin through infirmity they do not invent excuses, or go about to boast of their wickedness: but because wicked men think little of evil and artful speeches, we may be clear that God rules not in their souls. The original by declaring that the words of the wicked are falsehood and deceit is peculiarly strong; as if they were not only false in quality, but actual falseness itself. He hath left off to be wise, and to do good. From the good way he has altogether gone aside. Men who fear God proceed from strength to strength in the right path, but godless men soon forsake what little good they once knew. How could men apostatise if they had respect unto the supreme Judge? Is it not because they grow more and more forgetful of God, that in due season they relinquish even that hypocritical reverence of him which in former days they maintained in order to flatter their souls?

The words of his mouth are iniquity and deceit. This pair of hell dogs generally hunt together, and what one does not catch the other will; if iniquity cannot win by oppression, deceit will gain by chicanery. When the heart is so corrupt as to flatter itself, the tongue follows suit. The open sepulchre of the throat reveals the foulness of the inner nature.

The words of his mouth are iniquity - In the principle; and deceit calculated to pervert others, and lead them astray. He hath left off to be wise, and to do good - His heart is become foolish, and his actions wicked. He has cut off the connection between himself and all righteousness.

The words of his mouth are iniquity and deceit - Are false and wicked. See the notes at Psa 12:2. It is words do not fairly represent or express what is in his heart. He hath left off to be wise - To act wisely; to do right. And to do good - To act benevolently and kindly. This would seem to imply that there had been a change in his conduct, or that he was not what he once professed to be, and appeared to be. This language would be applicable to the change in the conduct of Saul toward David after he became envious and jealous of him 1 Sam. 18; and it is possible, as Amyraldus supposed, that this may have had particular reference to him. But such instances of a change, of feeling and conduct are not very uncommon in the world, and it may doubtless have happened that David experienced this more than once in his life.