In vv. 40-46 the whole history of Israel is summed up as alternating periods of sin, punishment, deliverance, recurring in constantly repeated cycles, in which the mystery of human obstinacy is set over against that of Divine long-suffering, and one knows not whether to wonder most at the incurable levity which learned nothing from experience, or the inexhaustible long-suffering which wearied not in giving wasted gifts. Chastisement and mercies were equally in vain. The outcome of God's many deliverances was, "they rebelled in their counsel"—i.e., went on their own stiff-necked way, instead of waiting for and following God's merciful plan, which would have made them secure and blessed. The end of such obstinacy of disobedience can only be, "they were brought low through their iniquity." The psalmist appears to be quoting Lev. xxvi. 39, "they that are left of you shall pine away in their iniquity"; but he intentionally slightly alters the word, substituting one of nearly the same sound, but with the meaning of being brought low instead of fading away. To follow one's own will is to secure humiliation and degradation. Sin weakens the true strength and darkens the true glory of men.
In vv. 44-46 the singer rises from these sad and stern thoughts to recreate his spirit with the contemplation of the patient loving-kindness of God. It persists through all man's sin and God's anger. The multitude of its manifestations far outnumbers that of our sins. His eye looks on Israel's distress with pity, and every sorrow on which He looks He desires to remove. Calamities melt away beneath His gaze, like damp-stains in sunlight. His merciful "look" swiftly follows the afflicted man's cry. No voice acknowledges sin and calls for help in vain. The covenant forgotten by men is none the less remembered by Him. The numberless number of His loving-kindnesses, greater than that of all men's sins, secures forgiveness after the most repeated transgressions. The law and measure of His "repenting" lie in the endless depths of His own heart. As the psalmist had sung at the beginning, that loving-kindness endures for ever; therefore none of Israel's many sins went unchastised, and no chastisement outlasted their repentance. Solomon had prayed that God would "give them compassion before those who carried them captive" (1 Kings viii. 50); and thus has it been, as the psalmist joyfully sees. He may have written when the Babylonian captivity was near an end, and such instances as those of Daniel or Nehemiah may have been in his mind. In any case, it is beautifully significant that a psalm, which tells the doleful story of centuries of faithlessness, should end with God's faithfulness to His promises, His inexhaustible forgiveness, and the multitude of His loving-kindnesses. Such will be the last result of the world's history no less than of Israel's.
The psalm closes with the prayer in ver. 47, which shows that it was written in exile. It corresponds in part with the closing words of Psalm cv. Just as there the purpose of God's mercies to Israel was said to be that they might be thereby moved to keep His statutes, so here the psalmist hopes and vows that the issue of his people's restoration will be thankfulness to God's holy name, and triumphant pealing forth from ransomed lips of His high praises.
Ver. 48 is the concluding doxology of the Fourth Book. Some commentators suppose it an integral part of the psalm, but it is more probably an editorial addition.