I. The sin itself that he charges them with—idolatry, that great provocation which they were so notoriously guilty of. 1. They frequented the places of idol-worship (v. 20): "Upon every high hill and under every green tree, in the high places and the groves, such as the heathen had a foolish fondness and veneration for, thou wanderest, first to one and then to another, like one unsettled, and still uneasy and unsatisfied; but in all playing the harlot," worshipping false gods, which is spiritual whoredom, and was commonly accompanied with corporal whoredom too. Note, Those that leave God wander endlessly, and a vagrant lust is insatiable. 2. They made images for themselves, and gave divine honour to them (v. 26, 27); not only the common people, but even the kings and princes, who should have restrained the people from doing ill, and the priests and prophets, who should have taught them to do well, were themselves so wretchedly sottish and stupid, and under the power of such a strong delusion, as to say to a stock, "Thou art my father (that is, Thou art my god, the author of my being, to whom I owe duty and on whom I have a dependence)," and to a stone, to an idol made of stone, "Thou hast begotten me, or brought me forth; therefore protect me, provide for me, and bring me up." What greater affront could men put upon God, who is our Father that has made us? It was a downright disowning of their obligations to him. What greater affront could men put upon themselves and their own reason than to acknowledge that which is in itself absurd and impossible, and, by making stocks and stones their parents, to make themselves no better than stocks and stones? When these were first made the objects of worship they were supposed to be animated by some celestial power or spirit; but by degrees the thought of this was lost, and so vain did idolaters become in their imagination, even the princes and priests themselves, that the very idol, though made of wood and stone, was supposed to be their father, and adored accordingly. 3. They multiplied these dunghill deities endlessly (v. 28): According to the number of thy cities are thy gods, O Judah! When they had forsaken that God who is one, and all-sufficient for all, (1.) They were not satisfied with any gods they had, but still desired more, that idolatry being in this respect of the same nature with covetousness, which is spiritual idolatry (for the more men have the more they would have), which is a plain evidence that what men make an idol of they find to be insufficient and unsatisfying, and that it cannot make the comers thereunto perfect. (2.) They could not agree in the same god. Having left the centre of unity, they fell into endless discord; one city fancied one deity and another another, and each was anxious to have one of its own to be near them and to take special care of them. Thus did they in vain seek that in many gods which is to be found in one God only.