Here is, 1. The close application which David made of the word of God to himself: He hid it in his heart, laid it up there, that it might be ready to him whenever he had occasion to use it; he laid it up as that which he valued highly, and had a warm regard for, and which he was afraid of losing and being robbed of. God's word is a treasure worth laying up, and there is no laying it up safely but in our hearts; if we have it only in our houses and hands, enemies may take it from us; if only in our heads, our memories may fail us: but if our hearts be delivered into the mould of it, and the impressions of it remain on our souls, it is safe. 2. The good uses he designed to make of it: That I might not sin against thee. Good men are afraid of sin, and are in care to prevent it; and the most effectual way to prevent is to hide God's word in our hearts, that we may answer every temptation, as our Master did, with, It is written, may oppose God's precepts to the dominion of sin, his promises to its allurements, and his threatenings to its menaces.

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, Psa 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".