They are both stupid and foolish; the instruction of idols is but wood!
The Prophet shews here, in one sentence, that the wisest in the whole world could be proved guilty of the greatest madness, or of a twofold folly, because they willingly worshipped the trunks of trees, and they worshipped stones; for Under one kind he includes the other.
The prophet Isaiah, when he prophesied of the captivity in Babylon, added warnings against idolatry and largely exposed the sottishness of idolaters, not only because the temptations in Babylon would be in danger of drawing the Jews there to idolatry, but because the afflictions in Babylon were designed to cure them of their idolatry.
Commenting on Jeremiah 10:1-16
But they are altogether brutish and foolish,.... In comparison of the Lord, there is no knowledge and wisdom in them, this is a certain fact; they are verily brutish and foolish; or they are one and all so, there is not a wise man among them: or, "in one thing they are brutish" (r), &c.; namely, in their idolatry; however wise they may be in...