1 Corinthians 3:20

“And again, etc.] Not in the same place, nor in the same book, but in the Psalms, in (<199411>Psalm 94:11). This form of citing Scriptures answers to dw[w and moreover, used by the Jewish doctors when the matter does not so clearly appear from the first proof, and therefore they produce another f40: and so here the apostle, for the further confirmation and illustration of this point, that the wisdom of this world is foolishness with God, to the testimony of Eliphaz, adds this of David, the Lord knoweth the thoughts of the wise, that they are vain; in the Psalms it is, “the Lord knoweth the thoughts of men, that they are vanity”; which the apostle not only cites, but explains and teaches; as…”

“Quotation from Psa 94:11. There it is of men; here it is "of the wise." Paul by inspiration states the class of men whose "thoughts" (or rather, "reasonings," as suits the Greek and the sense of the context) the Spirit designated in the Psalm, "vanity," namely, the "proud" (Psa 94:2) and worldly-wise, whom God in Psa 94:8 calls "fools," though they "boast themselves" of their wisdom in pushing their interests (Psa 94:4).”

“And again, - Psalms 94:11. The Lord knoweth - God searches the heart. The particular thing which it is here said that he knows, is, that the thoughts of man are vain. They have this quality; and this is that which the psalmist here says that God sees. The affirmation is not one respecting the omniscience of God, but with respect to what God sees of the nature of the thoughts of the wise. The thoughts of the wise - Their plans, purposes, designs. That they are vain - That they lack real wisdom; they are foolish; they shall not be accomplished as they expect; or be seen to have that wisdom which they now suppose they possess. return to 'Top of Page'”

“That they are but vain - Empty, foolish; they and all their thoughts. Psa 94:11. 1 Corinthians 3:21”

“the lord: Psa 94:11 that: Job 11:11, Job 11:12; Psa 2:1; Rom 1:21; Col 2:8 1 Corinthians 3:21”