Psalms 19:12

“Who can understand [his] errors? etc.] Sin is an error, a wandering out of the way of God, swerving from the rule of his word; and many mistakes are made by the people of God themselves; even so many that they cannot number them; they are more than the hairs of their head; they cannot understand, find out and express, neither their number, nor their evil nature, nor the many aggravating circumstances which attend them: this the psalmist said, upon a view of the large extent, glory, and excellency of the word of God; and upon comparing himself with it, in which, as in a glass, he saw how far short he came of it, and what a disagreement and want of conformity there was in him unto it; (see…”

“The clearer our view of the law, the more manifest are our sins. Still for its full effect we need divine grace to show us our faults, acquit us, restrain us from the practice, and free us from the power, of sin. Thus only can our conduct be blameless, and our words and thoughts acceptable to God. Next: Psalms Chapter 20”

“Who can understand his errors? - The word rendered errors is derived from a verb which means to wander, to go astray; then, to do wrong, to transgress. It refers here to wanderings, or departures from the law of God, and the question seems to have been asked in view of the purity, the strictness, and the extent of the law of God. In view of a law so pure, so holy, so strict in its demands, and so extended in its requirements - asserting jurisdiction over the thoughts, the words, and the whole life - who can recall the number of times that he has departed from such a law? A sentiment somewhat similar is found in Psalms 119:96, “I have seen an end of all perfection; thy commandment is…”

“Who - Thy law, O Lord, is holy and just and good. But I fall infinitely short of it. Cleanse - Both by justification, through the blood of thy son; and by sanctification thro' thy holy spirit. Though the first may seem to be principally intended, because he speaks of his past sins. Secret - From the guilt of such sins as were secret either, from others; such as none knows but God and my own conscience: or, from myself; such as I never observed, or did not discern the evil of. Pardon my unknown sins, of which I never repented particularly, as I should have done. Psalms 19:13”

“19:12-14 The psalmist knows his faults, so he prays to remain faithful and commits himself to the Lord.”

“can: Psa 40:12; Job 6:24; Isa 64:6; Co1 4:4; Heb 9:7 cleanse: Psa 51:5-10, Psa 65:3; Jo1 1:7 secret: Psa 90:8, Psa 139:2, Psa 139:23, Psa 139:24; Lev. 4:2-35; Jer 17:9 Psalms 19:13”