Psalms 69:5

5.O God! thou knowest my foolishness Augustine has labored to little purpose to show in what way these words are applicable to Christ; and at length he transfers to his members that which could not properly be said of the Head. (72) David here uses the language of irony; and by this mode of expressing himself he meant to intimate, that, overwhelmed with the unrighteous judgments of men, he betakes himself to God, and implores him to appear as the defender of his cause. This is much more emphatic than if he had affirmed plainly, and without figure, that his integrity was known to God. In this way he administers a sharp rebuke to his enemies, and as it were looks down with a noble contempt upon the calumnious speeches which they uttered against him; as Jeremiah does when he says,

“O Lord! thou hast deceived me, and I was deceived.”
(Psalms 20:7)

Some ignorant people put a violent construction on these words of Jeremiah, as if they implied that he was actually deceived; whereas he is rather to be understood as deriding with bitter sarcasm his calumniators, who, in speaking evil of him, were chargeable with reproaching and blaspheming God himself. David in like manner, in the passage before us, as a means of preserving himself from succumbing under the perverse judgments of men, appeals to God as the judge of his cause; and possessing as he did the approving testimony of a good conscience, he regards in a great measure with indifference the unjust estimate which men might form of his character. It were indeed desirable that our integrity should also be acknowledged and approved of by men, and that not so much on our own account as for the edification of our brethren. But if, after we have done all in our power to make men form a favorable opinion respecting us, they misconstruct and pervert every good word which we utter, and every good action which we perform, we ought to maintain such greatness of mind as boldly to despise the world and all false accusers, resting contented with the judgment of God and with that alone; for those who are over anxious about maintaining their good name cannot but often experience fainting of heart. Let us be always ready to satisfy men; but if they refuse to listen to what we have to say in self-vindication, let us proceed in our course through evil report as well as good report, following the example of Paul where he fearlessly appeals to the judgment of God,

“who will bring to light the hidden things of dark,”
(1 Corinthians 4:5)