Here is, 1. David in care to be found in the way of his duty. His constant desire and design are to keep the testimony of God's mouth, to keep to it as his rule and to keep hold of it as his confidence and portion for ever. This we must keep, whatever we lose. 2. David at prayer for divine grace to assist him therein: "Quicken me after thy lovingkindness (make me alive and make me lively), so shall I keep thy testimonies," implying that otherwise he should not keep them. We cannot proceed, nor persevere, in the good way, unless God quicken us and put life into us; we are therefore here taught to depend upon the grace of God for strength to do every good work, and to depend upon it as grace, as purely the fruit of God's favour. He had prayed before, Quicken me in thy righteousness (Psa 119:40); but here, Quicken me after thy lovingkindness. The surest token of God's good-will toward us is his good work in us.

Unless thy law had been my delights,.... Not the law of works, the voice of words, which they that heard entreated they might hear no more; which is terrible, and works wrath in the conscience; is a cursing and damning law to the transgressors of it; and so not delightful, unless as considered in the hands of Christ, the fulfilling end of it: but the law of faith, the doctrine of faith, or of justification by the righteousness of Christ, received by faith, which yields peace, joy, and comfort, even in tribulation: or the whole doctrine of the Gospel, the law of the Messiah, the isles waited for; the doctrine of peace, pardon, righteousness, and eternal life by Christ, which is exceeding delightful to sensible sinners;

I should then have perished in mine affliction; referring to some particular time of affliction he was pressed with, either through the persecution of Saul, or the conspiracy of Absalom which was very great and heavy upon him, so that he almost despaired of deliverance from it; and must have perished, not eternally, but as to his comforts: his heart would have fainted in him, and he would have sunk under the weight of the affliction, had it not been for the relief he had from the word of God, the doctrines and promises of it; he was like one in a storm, tossed with tempests, one wave after another beat upon him, and rolled over him, when he thought himself just perishing; and must have given all over for lost, had it not been for the delight and pleasure he found in reading and meditating on the sacred writings.