(12) His eulogium on the Law was not Pharisaic or formal, for the poet instantly gives expression to his sense of his own inability to keep it. If before we were reminded of St. Paul's, "The law is holy, and the commandment holy, and just, and good," (Romans 7:12), his own spiritual experience, contained in the same chapter, is here recalled: "For the good that I would I do not: but the evil that I would not, that I do."

Who can understand.--In the original the abruptness of the question is very marked and significant. Errors who marks? From unconscious ones clear me, i.e., pronounce me innocent, not cleanse, as in Authorised Version.

Verses 12-14. - A consideration of the Law cannot but raise the thought of transgression. Man "had not known sin but by the Law" (Romans 7:7), and he cannot contemplate the Law without being reminded of possible disobedience to it. The psalmist's thoughts are led in this direction, and he ends with an earnest prayer against "secret sins" (ver. 12), against "presumptuous sins" (ver. 13), and against sins of word and thought (ver. 14), addressed to "God his Strength [or, 'his Rock'] and his Redeemer." Verse 12. - Who can understand his errors? rather, who can discern (or, perceive) his errors? i.e. all of them. Who will not overlook some, try as he may to search out his heart? Cleanse thou me from secret faults. Those which are hidden from me, which I cannot discern.

19:11-14 God's word warns the wicked not to go on in his wicked way, and warns the righteous not to turn from his good way. There is a reward, not only after keeping, but in keeping God's commandments. Religion makes our comforts sweet, and our crosses easy, life truly valuable, and death itself truly desirable. David not only desired to be pardoned and cleansed from the sins he had discovered and confessed, but from those he had forgotten or overlooked. All discoveries of sin made to us by the law, should drive us to the throne of grace, there to pray. His dependence was the same with that of every Christian who says, Surely in the Lord Jesus have I righteousness and strength. No prayer can be acceptable before God which is not offered in the strength of our Redeemer or Divine Kinsman, through Him who took our nature upon him, that he might redeem us unto God, and restore the long-lost inheritance. May our hearts be much affected with the excellence of the word of God; and much affected with the evil of sin, and the danger we are in of it, and the danger we are in by it.Who can understand his errors?.... 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 Psalm 119:97; and he suggests, that though the word he had been describing was perfect, pure, and clean, he was not; nor could he expect any reward of debt, but merely of grace, for his observance of it; and that it was best, under a sense of sin, to have recourse, not to works of righteousness done by men; but to the grace and mercy of God in Christ, as follows:

cleanse thou me from secret faults; by which are meant not such sins as are done in secret, and are unknown to men; such as David's sin with Bathsheba, 2 Samuel 12:12; nor the inward motions of sin in the heart, to which none are privy but God, and a man's own soul; not but that each of these may be properly enough included in such a petition; but sins, which are unknown to a man himself are meant: there are some actions, which, though known when committed, are not known to be sinful ones; and there are some sins which are committed unadvisedly, and through carelessness, and pass unobserved; not only many vain and sinful thoughts pass to and fro uncontrolled, without being taken notice of; but many foolish and idle words are spoken, and many evil actions, through infirmity and inadvertency, are done, which, when a good man, at the close of a day, comes to reflect upon the things that have passed in it, are quite hidden from him, are unknown to him, being unobserved by him; wherefore such a petition is highly proper to be inserted in his address at the throne of grace: and which also supposes the person sensible of the defiling nature of sin, and of his own impotency to cleanse himself from it; and that God only can do it, who does it by the application of the blood of his Son, which cleanses from all sin; for this respects not regenerating and sanctifying grace, but pardoning grace; a manifestation of it, a view of acquittance from sin by Christ, and of freedom from obligation to punishment for it.