Jeremiah 10:2 - Matthew Poole's English Annotations on the Holy Bible

Learn not the way of the heathen: the Jews being to live among the Chaldeans in their captivity, where many of them were already, the prophet in this sermon admonisheth them against the superstitions of the Chaldean idolatries, which he understands here by heathen, who were also much addicted to astrology, and esteemed it the original of sciences; the customs and their manners he calls here their way, as is frequent in Scripture, Leviticus 18:3, Leviticus 20:23. Be not dismayed at the signs of heaven: this was a practice and study so common among them, that judicial astrologers, of what nation soever, were generally termed Chaldeans; a practice so hateful to God, that sometimes he positively prohibits it, Deuteronomy 18:10,14, and sometimes in a way of scorn and derision sarcastically sends them to such, Isaiah 47:13, and often labours to persuade against it; for though astronomy be not only lawful, but useful, as being subject to reason and the rules of art, whereby many actions of human life are directed, and guided, and proportioned, yet judiciary astrology is indeed originally diabolical and heathenish; and though God do suffer their predictions sometimes to fall out right, yet it is to punish the curiosity of the inquirer. For the heathen are dismayed at them: q.d. Leave this to heathens; it doth not become God's people, who do wholly depend upon him; for indeed the heathen, as many ignorant Christians do to this day, were more afraid of the signs of heaven and astrological predictions than of God, and what is foretold in his word of prophecy, as if things were governed rather by the influence of the stars than the providence of God; not but that we may be affected with such preternatural appearances in the world, which God doth extraordinarily cause to appear, as some tokens of his approaching judgments, Joel 2:30,31 Mt 24:7 Luke 21:11.