In thy precepts That to which I formerly adverted must not be forgotten -- the prophet's not making a boast of his own acquirements, but setting before others an example for their imitation. We are aware that the majority of mankind are so much involved in the cares of the world, as to leave no time or leisure for meditating upon the doctrine of God. To meet this callous indifference, he very seasonably commends diligence and attention. And even were we not so ensnared by the world, we know how readily we lose sight of the law of God, in the daily temptations which suddenly overtake us. It is not therefore without reason that the prophet exhorts us to constant exercise, and enjoins us to direct all our energies to the subject of meditation on God's precepts. And as the life of men is unstable, being continually distracted by the carnality of their minds, he declares that he will consider attentively the ways of God. Subsequently, he repeats the exquisite pleasure he took in this pursuit. For our proficiency in the law of God will be small, until we cheerfully and heartily set our minds upon it. And, in fact, the commencement of a good life consists in God's law attracting us to him by its sweetness. By the same means the lusts of the flesh, too, are subdued or mitigated. In our natural state, what is more agreeable to us than that which is sinful? This will be the constant tendency of our minds, unless the delight which we feel in the law carry us in the opposite direction.

I will meditate in thy precepts - I will think of them; I will find my happiness in them. See the notes at Psalm 1:2.
And have respect unto thy ways - And look to thy ways - thy commands. I continually regard them, or refer to them in my mind as the guide of my life. See the notes at Psalm 119:6.

I will meditate -
12. He should encourage self-examination and reflection; and meditate frequently on God's words, works, and ways - and especially on his gracious dealings towards him.
13. He should keep his eye upon God's steps; setting the example of his Savior before his eyes, going where he would go, and nowhere else; doing what he would do, and nothing else; keeping the company that he would keep, and none else; and doing every thing in reference to the final judgment.

I will meditate in thy precepts,.... In his own mind; revolve them in his thoughts; consider well the nature, excellency, usefulness, and importance of them, and the obligations he lay under to observe them. The Targum is,
"I will speak of thy precepts;''
in conversation to others, and recommend them to them; so the Arabic version:
and have respect unto thy ways; or "look" (s) unto them; take heed unto them, and walk in them, and not wander from them; make them the rule of walk and conversation; as travellers look well to their ways, that they do not miss them, and go into wrong ways; they observe the directions that have been given them, and keep unto them; and so good men refer to the ways of the Lord, which the Scriptures point out unto them; see Jeremiah 6:16.
(s) "et aspiciam", Pagninus, Montanus; "et intueor", Tigurine version, Junius & Tremellius, Piscator.