The Prophet follows the same subject, that is, that Israel had not repented, though the Lord had in various ways invited them to repentance; yea, and constrained them by his scourges. It is indeed a proof of desperate and incurable wickedness, when God prevails nothing with us either by his word or by his stripes. When we are deaf to his teaching and admonitions, it is quite evident that we are wholly perverse: but when the Lord also raises up his hand and inflicts punishment, if then we bend not, what can be said, but that our sins have taken such deep roots, that they cannot be torn away from us? Hence God in these words shows that the Israelites were now past all remedy; for after having been so often and in so many ways warned, they did not return to the right way; nay, they did not think of their sins, but remained insensible. And Paul says of such that they are apelgekotas, ("past feeling," Ephesians 4:19,) that is void of feeling. When men are touched by no grief in their distresses, it is certain that they are smitten by the spirit of giddiness. Notwithstanding, the Israelites no doubt felt their evils; but the Prophet means, that they were so stupefied, that they did not consider the cause and source of them. And what can it avail, when one knows himself to be ill, and yet looks not to God, nor thinks that he is justly visited? Hence when any one cries only on account of the strokes, and regards not the hand of the striker, as another Prophet says, (Isaiah 9:13,) there is certainly in him complete stupidity. We hence see what the Prophet had in view when he said, that Israel did not understand while he was devoured by strangers, while hoariness was spreading over him; for he attended not to the cause of evils, but remained stupid; nor did he raise up his mind to God, so as to impute to his sins all the evils which he suffered. He says, that his strength was eaten by strangers God had promised that the people would be under his protection; and when they were exposed to the plunder of strangers, why did they not perceive that they were deprived of God's protection? And this could not have happened, except their own sin had deprived them of this privilege. Hence the Israelites must have been extremely blind and alienated in mind, when they did not perceive that they were thus spoiled by strangers, because God did not now defend them, nor was their patron, as he was wont to be formerly. He adds, that hoariness was upon him Some understand by this, that the Israelites were not improved by long succession of years. Age, as we know, through long experience, brings to men some prudence. Young people, even when the Lord invites them to himself, are carried away by some impulse or another; but in the aged there is greater prudence and moderation. Many hence think that the Israelites are here condemned because they had profited nothing -- no, not even by the advance of age. But the Prophet, I doubt not, expresses the greatness of their calamities by this mode of speaking, when he says that hoariness was sprinkled over him; for we know, that when any one is grievously pained and afflicted, he becomes hoary through the very pressure of evils; inasmuch as hoariness proceeds not only from years, but also from troubles and heavy cares, which not only waste men, but consume them. We indeed know that men grow old through the suffering of evils. And here, in my judgment, the Prophet means, that "hoariness had come upon Israel," -- that is, that he had been visited with so many evils, that he was worn out, as it were, with old age; and that, after all, he had derived no benefit. We now perceive the truth of what I have said before, that it was the constant teaching of the Prophet, that the diseases which prevailed among the people of Israel were incurable, for they could by no remedies be brought to repentance. It follows --

Strangers have devoured his strength, and he knoweth it not - Like Samson, when, for sensual pleasure, he had betrayed the source of his strength and God had departed from him, lsrael knew not how or wherein his alliancs with the pagan had impaired his strength. He thought his losses at the hand of the enemy, passing wounds, which time would heal; he thought not of them, as tokens of God's separation from him, that his time of trial was coming to its close, his strength decaying, his end at hand. Israel was not only incorrigible, but "past feeling" Ephesians 4:19, as the Apostle says of the pagan. The marks of wasting and decay were visible to sight and touch; yet he himself perceived not what all saw except himself. Israel had sought to strangers for help, and it "had turned to his decay." Pul and Tiglath-pileser had "devoured his strength," despoiling him of his wealth and treasure, the flower of his men, and the produce of his land, draining him of his riches, and hardly oppressing him through the tribute imposed upon him. But "like men quite stupified, they, though thus continually gnawed upon, yet suffered themselves willingly to be devoured, and seemed insensible of it." Yet not only so, but the present evils were the forerunners of worse. Grey hairs, themselves the effects of declining age and tokens of decay, are the forerunners of death. "Thy grey hairs are thy passing-bell," says the proverb .
The prophet repeats, after each clause, "he knoweth not." He knoweth nothing; be knoweth not the tokens of decay in himself, but hides them from himself; he knoweth not God, who is the author of them;. he knoweth not the cause of them, his sins; he knoweth not the end and object of them, his conversion; he knoweth not, what, since he knoweth not any of these things, will be the issue of them, his destruction. People hide from themselves the tokens of decay, whether of body or soul. And so death, whether of body or soul or both, comes upon them unawares. : "Looking on the surface, he imagines that all things are right with him, not feeling the secret worm which gnaws within. The outward garb remains; the rules of fasting are observed; the stated times of prayer are kept; but the heart is far from Me, saith the Lord. Consider diligently what thou lovest, what thou fearest, whereat thou rejoicest or art saddened, and thou will find, under the habit of religion, a worldly mind; under the rags of conversion, a heart of perversion."

Gray hairs are here and there upon him, yet he knoweth not - The kingdom is grown old in iniquity; the time of their captivity is at hand, and they are apprehensive of no danger. They are in the state of a silly old man, who through age and infirmities is become nearly bald, and the few remaining hairs on his head are quite gray. But he does not consider his latter end; is making no provision for that eternity on the brink of which he is constantly standing; does not apply to the sovereign Physician to heal his spiritual diseases; but calls in the doctors to cure him of old age and death! This miserable state and preposterous conduct we witness every day. O how fast does the human being cling to his native earth! Reader, hear the voice of an old man: -
O my coevals! remnants of yourselves,
Shall our pale withered hands be still stretched out?
Trembling at once with eagerness and age;
With avarice and ambition grasping-fast
Grasping at air! For what hath earth beside?
We want but little; nor That Little long.

Strangers have devoured his strength, and he knoweth [it] not: yea, (g) gray hairs are here and there upon him, yet he knoweth not.
(g) Which are a token of his manifold afflictions.

Strangers have devoured his strength,.... Or his substance, as the Targum; his wealth and riches, fortresses and strong holds: these strangers were either the Syrians, who, in the times of Jehoahaz, destroyed Ephraim or the Israelites, and so weakened them, as to make them like the dust by threshing, 2-Kings 12:7; or the Assyrians, first under Pul king of Assyria, who came out against Menahem king of Israel, and exacted a tribute of a thousand talents of silver, and so drained them of their treasure, which was their strength, 2-Kings 15:19; and then under Tiglathpileser, another king of Assyria, who came and took away from them many of their fortified places, and carried the inhabitants captive, 2-Kings 15:29;
and he knoweth it not; is not sensible how much he is weakened by such exactions and depredations; or does not take notice of the hand of God in all this; does not consider from whence it comes, what is the cause of it, and for what ends;
yea, gray hairs are here and there upon him, yet he knoweth not; or, "old age has sprinkled itself upon him" (s); or, "gray hairs are sprinkled on him"; gray hairs, when thick, are a sign that old age is come; and, when sprinkled here and there, are symptoms of its coming on, and of a person's being on the decline of life; and here it signifies the weak and declining state of Israel, through the exactions and depredations of their neighbours, and that theft utter ruin was near; and yet they did not know nor consider their latter end, nor repent of their sins and acknowledge them, and return unto the Lord, and implore his mercy: so carnal professors, who mix with the men of the world, that are strangers to God and godliness, and everything that is divine and good, are devoured by them; they lose their time and substance, and their precious souls, and are not aware of it. The symptoms of the declining state of the church of God are at this time upon us, and yet not taken notice of; such as great departures from the faith; a number of false teachers risen up; great failings off of professors, and of such who have made a great figure in the church; a small number of faithful men; great coldness and lukewarmness to spiritual things; little faith on the earth; great neglect of Gospel worship and ordinances; much sleepiness and drowsiness; great immorality and profaneness: as also the symptoms of the declining state of the world, and of its drawing to its period; as wars, and rumours of wars, famine, pestilence, and earthquakes in divers places; volcanos, burning mountains, eruptions of subterraneous fire, which portend the general conflagration; and yet these things are little attended to.
(s) "canities sparsit se in eo", Pagninus, Montanus, Cocceius, Schmidt; "cani sparsi sunt", Tigurine version; "canities aspergit eum", Junius & Tremellius, Piscator; so Latin writers: "sparserit et nigras alba senecta comas". Propert. l. 3. Eleg. 4. "James mihi deterior canis aspergitur aetas". Ovid. de Ponto, l. 1. Eleg. 5.

Strangers--foreigners: the Syrians and Assyrians (2-Kings 13:7; 2-Kings 15:19-20; 2-Kings 17:3-6).
gray hairs--that is, symptoms of approaching national dissolution.
are here and there upon--literally, "are sprinkled on" him.
yet he knoweth not--Though old age ought to bring with it wisdom, he neither knows of his senile decay, nor has the true knowledge which leads to reformation.

Knoweth it not - He is not aware of the loss he hath sustained. Gray hairs - Of old age and declining strength are upon their kingdom.