What profit is there in my blood, when I go down to the pit? Shall the {k} dust praise thee? shall it declare thy truth?

(k) David means that the dead are not profitable to the congregation of the Lord here in the earth: therefore he would live to praise his Name, which is the end of man's creation.

Wesley's Notes

30:9 Profit - What wilt thou gain by it? The dust - Shall they that are dead celebrate thy goodness in the land of the living? Or, shall my dust praise thee?

Matthew Henry's Concise Commentary

30:6-12 When things are well with us, we are very apt to think that they will always be so. When we see our mistake, it becomes us to think with shame upon our carnal security as our folly. If God hide his face, a good man is troubled, though no other calamity befal him. But if God, in wisdom and justice, turn from us, it will be the greatest folly if we turn from him. No; let us learn to pray in the dark. The sanctified spirit, which returns to God, shall praise him, shall be still praising him; but the services of God's house cannot be performed by the dust; it cannot praise him; there is none of that device or working in the grave, for it is the land of silence. We ask aright for life, when we do so that we may live to praise him. In due time God delivered the psalmist out of his troubles. Our tongue is our glory, and never more so than when employed in praising God. He would persevere to the end in praise, hoping that he should shortly be where this would be the everlasting work. But let all beware of carnal security. Neither outward prosperity, nor inward peace, here, are sure and lasting. The Lord, in his favour, has fixed the believer's safety firm as the deep-rooted mountains, but he must expect to meet with temptations and afflictions. When we grow careless, we fall into sin, the Lord hides his face, our comforts droop, and troubles assail us.