|Matthew Henry's Concise Commentary|
71:14-24 The psalmist declares that the righteousness of Christ, and the great salvation obtained thereby, shall be the chosen subject of his discourse. Not on a sabbath only, but on every day of the week, of the year, of his life. Not merely at stated returns of solemn devotion, but on every occasion, all the day long. Why will he always dwell on this? Because he knew not the numbers thereof. It is impossible to measure the value or the fulness of these blessings. The righteousness is unspeakable, the salvation everlasting. God will not cast off his grey-headed servants when no longer capable of labouring as they have done. The Lord often strengthens his people in their souls, when nature is sinking into decay. And it is a debt which the old disciples of Christ owe to succeeding generations, to leave behind them a solemn testimony to the advantage of religion, and the truth of God's promises; and especially to the everlasting righteousness of the Redeemer. Assured of deliverance and victory, let us spend our days, while waiting the approach of death, in praising the Holy One of Israel with all our powers. And while speaking of his righteousness, and singing his praises, we shall rise above fears and infirmities, and have earnests of the joys of heaven. The work of redemption ought, above all God's works, to be spoken of by us in our praises. The Lamb that was slain, and has redeemed us to God, is worthy of all blessing and praise.
Verse 15. - My mouth shall show forth thy righteousness and thy salvation all the day. Salvation is inseparable from righteousness. It is as being righteous himself that God accepts the righteous, and as faithful to his promises, which is a part of his righteousness, that he pardons penitents. For I know not the numbers thereof (comp. Psalm 40:5). God's acts of pardoning mercy, by which he brings about the salvation of penitents, are innumerable.
Gill's Exposition of the Entire Bible
My mouth shall show forth thy righteousness,.... Both his punitive justice in taking vengeance on his enemies, agreeably to the above imprecations; and his faithfulness in the performance of promises of good things unto him; as also his essential righteousness displayed and glorified in the redemption that is by Christ; and particularly the righteousness of Christ, accepted of God, and imputed by him; which the psalmist with his mouth declared his faith in, expressed his joy at, and set forth in a strong manner the glory and excellency of it, and determined to make mention of it, and of that only, as in Psalm 71:16;
and thy salvation all the day; both temporal and eternal; the glory of both, and praise for the same;
for I know not the numbers thereof; of that righteousness and salvation, the numerous blessings which are contained in them; see Psalm 40:5; or "though I know not the numbers of them" (c); though he could not fully declare the glories and excellencies of the righteousness and salvation of God, and the numerous mercies and rich grace included in them; yet he would attempt to set them forth in the best way he could, though in a feeble and imperfect manner.
(c) "quamvis", Junius & Tremellius, Piscator, Gejerus; So Ainsworth.
Jamieson-Fausset-Brown Bible Commentary
15. for I know … thereof—innumerable, as he had not time to count them.
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