These two verses are almost a repetition of the two foregoing verses, but with improvement. 1. David again professes his constant adherence to God and his duty, notwithstanding the many difficulties and discouragements he met with. He had said (Psa 119:14), I am small and despised, and yet adhere to my duty. Here he finds himself not only mean, but miserable, as far as this world could make him so: Trouble and anguish have taken hold on me - trouble without, anguish within; they surprised him, they seized him, they held him. Sorrows are often the lot of saints in this vale of tears; they are in heaviness through manifold temptations. There he had said, Yet do I not forget thy precepts; here he carries his constancy much higher: Yet thy commandments are my delights. All this trouble and anguish did not put his mouth out of taste for the comforts of the word of God, but he could still relish them and find that peace and pleasure in them which all the calamities of this present time could not deprive him of. There are delights, variety of delights, in the word of God, which the saints have often the sweetest enjoyment of when they are in trouble and anguish, Co2 1:5. 2. He again acknowledges the everlasting righteousness of God's word as before (Psa 119:142): The righteousness of thy testimonies is everlasting and cannot be altered; and, when it is admitted in its power into a soul, it is there an abiding principle, a well of living water, Joh 4:14. We ought to meditate much and often upon the equity and the eternity of the word of God. Here he adds, by way of inference, (1.) His prayer for grace: Give me understanding. Those that know much of the word of God should still covet to know more; for there is more to be known. He does not say, "Give me a further revelation," but, Give me a further understanding; what is revealed we should desire to understand, and what we know to know better; and we must go to God for a heart to know. (2.) His hope of glory: "Give me this renewed understanding, and then I shall live, shall live for ever, shall be eternally happy, and shall be comforted, for the present, in the prospect of it." This is life eternal, to know God, Joh 17:3.

Mine eyes prevent the night watches,.... The Targum is,

"the morning and evening watches.''

There were three of them; Kimchi interprets it of the second and third; the meaning is, that the psalmist was awake and employed in one religious exercise or another, praying, reading, or meditating; either before the watches were set, or however before the time that some of them took place, or at least before they were all over;

that I might meditate in thy word; he rose so early, in order to give himself up to meditation on the word of God; that he might be better instructed in the knowledge of divine things; that he might have solace and comfort from thence under his afflictions; and that he might be better furnished for the work of prayer; for the more familiar the word of God is to us, the better able we are to speak to God in his own language.