He that chastiseth the nations, shall not he correct? He would have them argue from the greater to the less, that if God did not spare even whole nations, but visits their iniquity with punishment, they could not imagine that he would suffer a mere handful of individuals to escape with impunity. The comparison intended, however, may possibly be between the Gentiles and the Jews. If God punished the heathen nations, who had not heard his word, with much severity, the Jews might expect that they, who had been familiarised to instruction in his house, would receive still sharper correction, and that he would vindicate his justice most in that nation over which he had chosen to preside. Still the former sense of the passage appears to me preferable, That it is folly in any number of individuals to flatter themselves with impunity, when they see God inflicting public punishment upon collective people. Some think there is an exclusive allusion to the signal and memorable instances of Divine judgment recorded in Scripture, as in the destruction of Sodom with fire from heaven, (Genesis 19.) and of the whole human family by the flood, (Genesis 7.) But the simpler meaning is best, That it were the height of madness in individuals to think that they could escape when nations perish. In adding that God teacheth men knowledge, [1] the Psalmist glances at the overweening confidence of such as despise God, and pride themselves in their acuteness and shrewdness, as we find Isaiah denouncing a woe against those crafty enemies of God who dig deep, that they may hide themselves from his sight, (Isaiah 29:15.) It is a disease prevalent enough in the world still. We know the refuges under covert of which both courtiers and lawyers take occasion to indulge in shameless mockery of God. It is as if the Psalmist had said -- You think to elude God through the confidence which you have in your acute understandings, and would pretend to dispute the knowledge of the Almighty, when, in truth, all the knowledge which is in the world is but as a drop from his own inexhaustible fullness.

Footnotes

1 - In our English Bible, the words shall not he know? are added. "But this is not acknowledged by the original nor by any of the versions. Indeed it is not necessary; for, either the words contain a simple proposition, It is he who teacheth man knowledge;' or this clause should be read in connection with verse 11, Jehovah, who teacheth man knowledge, he knoweth the devices of man, that they are vanity.' As he teaches knowledge to man, must He not know all the reasonings and devices of the human heart?" -- Dr Adam Clarke.

He that chastiseth the heathen - More literally, "Shall not the Reprover of nations - shall he not chastise - he that teaches man knowledge?" The idea is, that God exercises a government over the nations of the earth; that he has them under his control; that he brings heavy judgments on them; that he thus conveys great lessons to man. And shall not such a Being, in individual cases, reprove and correct for sin? It is assumed here that God, in fact, brings judgments on nations; that he does this by fire, flood, famine, pestilence; that these things are proofs that he presides over the nations of the earth; and the question here is, whether he that does this on the large scale must not be expected to do it in individual cases, so that the offender will not escape.
Shall not he correct? - Shall he not chastise, or bring judgments on offenders?
He that teacheth man knowledge - The idea in our translation, that he who imparts knowledge to mankind must himself possess intelligence, is a true one, but it is probably not that which is in the original. The sense is probably merely that God is the great Teacher, and this is the impression which it is intended should be impressed on the mind, leaving the consequences of this to be supplied by the reader: "He that teaches man all the knowledge that he has!" - reflect on the consequences of this, or what must follow from this! Such a Being cannot be ignorant; he must understand all things; he must, therefore, see human conduct everywhere as it is. The consequence - the result - of this is staffed in the next verse, that he must see the thoughts of man, and understand his real character.

He that chastiseth the heathen, shall not he correct? - You, who are heathens, and heathens of the most abandoned kind.
He that teacheth man knowledge - We here supply shall not he know? But this is not acknowledged by the original, nor by any of the Versions.
Indeed it is not necessary; for either the words contain a simple proposition, "It is he who teacheth man knowledge," or this clause should be read in connection with Psalm 94:11 : "Jehovah, who teacheth man knowledge, knoweth the devices of man, that they are vanity." As he teaches knowledge to man, must he not know all the reasonings and devices of the human heart?

He that chastiseth the (g) heathen, shall not he correct? he that teacheth man knowledge, [shall not he know]?
(g) If God punishes whole nations for their sins, it is mere folly for any one man or else a few to think that God will spare them.

He that chastiseth the Heathen,.... As he did the old world, by bringing a flood upon it, and sweeping away its inhabitants at once; and Sodom and Gomorrah, by raining fire and brimstone upon them, and consuming them from off the earth; and the old inhabitants of Canaan, by ejecting them out of their land for their abominations, with other similar instances:
shall he not correct? such audacious wretches, guilty of such atrocious crimes, such horrid murders, and gross atheism? certainly he will, as he has both a right and power to do it. The Targum is,
"is it possible that he should give the law to his people, and, when they have sinned, should they not be corrected?''
and if these are corrected and chastised, then surely such daring and insolent wretches shall not go unpunished: or, "he that instructeth the Heathen" (d); by the light of nature in things civil and moral, and therefore has a right to punish such who act contrary to it; see Romans 2:12,
he that teacheth man knowledge; that has given him the light of nature; inspired him with reason and understanding; taught him more than the beasts of the field, and made him wiser than the fowls of the heaven; from whom he has the knowledge of all arts and sciences, liberal and mechanic, those of the lower as well as of the higher class; see John 1:9. The Targum is,
"has not the Lord taught the first man knowledge?''
that more perfect knowledge of things, which Adam had in innocence, was from the Lord; and therefore,
shall not he know? all persons and things? verily he does; he is a God of knowledge, of all knowledge; his knowledge and understanding is infinite; it reaches to all persons, and to all their thoughts, words, and actions: this clause is not in the Hebrew text; but is understood, and rightly supplied; see 2-Samuel 5:8, compared with 1-Chronicles 11:6.
(d) "an erudiens gentes", Cocceius.

Know - Mens thoughts and words and actions.