For the customs of the people are vain: for one cutteth a tree out of the forest, the work of the hands of the workman, with the axe.
The Prophet seems to break off his subject, and even to reason inconclusively; for he had said in the last verse, “Learn not the rites of the Gentiles, and fear not the celestial signs;” and he now adds, Because the rites of the Gentiles are vanity; for wood they cut down from the forest. He seems then, as though forgetting himself, to have passed off to idols.
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
For the customs of the people are vain,.... Or, "their decrees", or "statutes" (o), their determinations and conclusions, founded upon the observation of the stars; or, their "rites and ceremonies" (p) in religion, in the worship of the sun and moon, and the hosts of heaven.