Quicken me according to thy goodness This verse contains nothing new. In the beginning of it David represents his life as depending on God's mercy, not only because he was conscious of human frailty, but because he saw himself daily exposed to death in multiplied forms, or rather because he was convinced, that were God's power withdrawn from him, he would be laid prostrate as if he were dead. He next promises, that when he shall be again restored to life, he will not be ungrateful, but will duly acknowledge this as a blessing from God, and that not only with the tongue, but also in his whole life. As the various instances in which God succors us and delivers us from dangers are so many new lives, it is reasonable that we should dedicate to his service whatever additional time is allotted to us in this world. When the law is called the testimony of God's mouth, by this eulogium its authority is very plainly asserted.

Quicken me - Cause me to live; revive me. See Psalm 71:20, note; Ephesians 2:1, note. Compare Psalm 80:18; Romans 8:11; 1-Peter 3:18; John 6:63.
After thy loving-kindness - Thy mercy; thy grace; thy compassion. That is, Let the measure of the grace given to me be thine own benevolent nature, and not my deserts. That is all I ask; that is all I could desire.
So shall I keep the testimony of thy mouth - Which proceeds out of thy mouth. His hope of being able to keep it was founded on the grace and mercy which he besought God to bestow upon him.

Quicken me - Make and keep me alive.
So shall I keep - Without the spiritual life there is no obedience; we must therefore rise from the dead, and be quickened by the Spirit of Christ.

Quicken me after thy lovingkindness,.... According to it, and with it; let me have some discoveries of it, and of interest in it; and that will quicken me, revive and comfort me, under all the reproaches, ill usage, and persecutions of men. The love of God shed abroad in the heart comforts and supports under all sorts of afflictions; it quickens the graces of the Spirit, and brings them forth into lively exercise, as faith, hope, and love; and to a diligent and fervent discharge of every duty: it constrains to love the Lord, and live to him, to his glory, in obedience to his will;
so shall I keep the testimony of thy mouth; the word of God, which comes out of his mouth, testifies of him, and of his mind and will; and which is to be received and observed, as being greater than the testimony of men, 1-John 5:9.