Blessed art thou, O Jehovah! Such had been the prophet's proficiency, that he was not only one of God's disciples, but also a public teacher of the Church. Nevertheless, acknowledging himself and all the upright to be only one their journey till they arrive at the close of life, he fails not to ask for the spirit of understanding. This passage informs us generally, that if God do not enlighten us with the spirit of discernment, we are not competent to behold the light which shines forth from his law, though it be constantly before us. And thus it happens, that not a few are blind even when surrounded with the clear revelation of this doctrine, because, confident in their own perspicacity, they contemn the internal illumination of the Holy Spirit. Farther, let us learn from this passage, that none are possessed of such superiority of intellect as not to admit of constant increase. If the prophet, upon whom God had conferred so honorable an office as a teacher of the Church, confesses himself to be only a disciple or scholar, what madness is it for those who are, greatly behind him in point of attainments not to strain every nerve to rise to higher excellence? Nor does he depend upon his own merits for obtaining his requests; he beseeches God to grant them from a regard to his own glory. This appears from the phraseology by which he introduces his request, Blessed art thou, O Jehovah! intimating, that his confidence of success originated in God's being fully entitled to all praise on account of his unbounded goodness, justice, and mercy.

Blessed art thou, O Lord - Blessed art thou as the author of such a law. This language of benediction or doxology is an outbreak of feeling or adoration in view of such a law - so good, so holy, so suited to direct and guide man. The mind is full of the subject; and the lips give vent to the feeling of gratitude and joy that such a law had been revealed to people.
Teach me thy statutes - Make me more and more acquainted with a law so pure, so rich, so valuable.

Blessed art thou -
8. He must acknowledge the mercy of God, in so far preserving him from all the consequences of his sin.
9. He should beg of him to become his teacher that his heart and conscience might be instructed in the spirituality of his statutes.

Blessed art thou, O Lord,.... In himself, in his nature, persons, and perfections; the fountain of all happiness to angels and men, in time and to eternity; to whom all blessing, honour, and glory, are to be given. The psalmist takes this method of praising and ascribing blessing to God, for what he had received from him; particularly for teaching him what he had learned, Psalm 119:7; in hopes of succeeding in his following request:
teach me thy statutes; the knowledge of the best is imperfect. Good men desire to know more of God, of his mind and will, even of his revealed will; and that they may have grace and strength to act in conformity to it; for it is not the bare theory of things they desire to be taught, but the practice of them; and though ministers, and the ministry of the word, and administration of ordinances, may be and are means of teaching; yet there is none teaches like the Lord, Father, Son, and Spirit. The Targum and Syriac versions render it, "teach me thy decrees".