Adam Clarke's Bible Commentary Verse 2. But his delight is in the law of the Lord ] wxpj chephtso, his will, desire, affection, every motive in his heart, and every moving principle in his soul, are on the side of God and his truth. He takes up the law of the Lord as the rule of his life; he brings all his actions and affections to this holy standard. He looketh into the perfect law of liberty; and is not a forgetful hearer, but a doer of the word; and is therefore blessed in his deed. He not only reads to gain knowledge from the Divine oracles, but he meditates on what he has read, feeds on it; and thus receiving the sincere milk of the word, he grows thereby unto eternal life.
This is not an occasional study to him; it is his work day and night. As his heart is in it, the employment must be frequent, and the disposition to it perpetual.
Matthew Henry Commentary
Verses 1-3 - To meditate in God's word, is to discourse with ourselves concernin the great things contained in it, with close application of mind an fixedness of thought. We must have constant regard to the word of God as the rule of our actions, and the spring of our comforts; and have it in our thoughts night and day. For this purpose no time is amiss.
Original Hebrew כי3588 אם518 בתורת8451 יהוה3069 חפצו2656 ובתורתו8451 יהגה1897 יומם3119 ולילה׃3915