Psalms 79:5

5How long, O Jehovah! wilt thou be wroth for ever? I have already observed that these two expressions, how long and for ever, when joined together, denote a lengthened and an uninterrupted continuance of calamities; and that there is no appearance, when looking to the future, of their coming to a termination. We may, therefore, conclude that this complaint was not ended within a month or two after persecution against the Church commenced, but at a time when the hearts of the faithful were almost broken through the weariness produced by prolonged suffering. Here they confess that the great accumulation of calamities with which they are overwhelmed, is to be traced to the wrath of God. Being fully persuaded that the wicked, whatever they may plot, cannot inflict injury, except in so far as God permits them — from this, which they regard as an indubitable principle, they at once conclude, that when he allows such ample scope to their heathen enemies in persecuting them, his anger is greatly provoked. Nor would they, without this persuasion, have looked to God in the hope that he would stretch forth his hand to save them; for it is the work of Him who hath given loose reins to draw in the bridle. Whenever God visits us with the rod, and our own conscience accuses us, it especially becomes us to look to His hand. Here his ancient people do not charge him with being unjustly displeased, but acknowledge the justice of the punishment inflicted upon them. God will always find in his servants just grounds for chastising them. He often, however, in the exercise of his mercy, pardons their sins, and exercises them with the cross for another purpose than to testify his displeasure against their sins, just as it was his will to try the patience of Job, and as he vouchsafed to call the martyrs to an honorable warfare. But here the people, of their own accord, summoning themselves before the Divine tribunal, trace the calamities which they endured to their own sins, as the procuring cause. Hence it may, with probability, be conjectured that this psalm was composed during the time of the Babylonish captivity. Under the tyranny of Antiochus Epiphanes, they employed, as we have previously seen, a different form of prayer, saying,

“All this is come upon us; yet have we not forgotten thee, neither have we dealt falsely in thy covenant. Our heart is not turned back, neither have our steps declined from thy way,”
(Psalms 44:17.)

We are not to suppose that, in the passage now quoted, the faithful murmured against God, but they employ this language because they knew that he had another end in view than simply to punish their sins; for, by means of these severe conflicts, he prepared them for the prize of their high calling.