My tongue also shall talk of thy righteousness all the day long: for they are confounded, for they are brought unto shame, that seek my hurt. Talk of thy righteousness - The righteousness of God is frequently used in this Psalm, and in other places, to signify his justice, judgments, faithfulness, truth, mercy, etc. There are few words of more general import in the Bible.
They are confounded - The counsel of Ahithophel is confounded, and turned to foolishness, and he was so ashamed that he went and hanged himself. As to the vain and wicked Absalom, he met with the fate that he had meditated against his father. Though not yet done, David sees all these things as actually accomplished; for he had got a Divine assurance that God would bring them to pass.
Commentary on the Bible, by Adam Clarke [1831].