1. In the nature of the sin itself that they were guilty of. They forsook God for idols, which was the most horrible thing that could be, for they put a most dangerous cheat upon themselves (v. 14, 15): Will a thirsty traveller leave the snow, which, being melted, runs down from the mountains of Lebanon, and, passing over the rock of the field, flows in clear, clean, crystal streams? Will he leave these, pass these by, and think to better himself with some dirty puddle-water? Or shall the cold flowing waters that come from any other place be forsaken in the heat of summer? No; when men are parched with heat and drought, and meet with cooling refreshing streams, they will make use of them, and not turn their backs upon them. The margin reads it, "Will a man that is travelling the road leave my fields, which are plain and level, for a rock, which is rough and hard, or for the snow of Lebanon, which, lying in great drifts, makes the road impassable? Or shall the running waters be forsaken for the strange cold waters? No; in these things men know when they are well off, and will keep so; they will not leave a certainty for an uncertainty. But my people have forgotten me (v. 15), have quitted a fountain of living waters for broken cisterns. They have burnt incense to idols, that are as vain as vanity itself, that are not what they pretend to be nor can perform what is expected from them." They had not the common wit of travellers, but even their leaders caused them to err, and they were content to be misled. (1.) They left the ancient paths, which were appointed by the divine law, which had been walked in by all the saints, which were therefore the right way to their journey's end, a safe way, and, being well-tracked, were both easy to hit and easy to walk in. But, when they were advised to keep to the good old way, they positively said that they would not, ch. vi. 16. (2.) They chose by-paths; they walked in a way not cast up, not in the highway, the King's highway, in which they might travel safely, and which would certainly lead them to their right end, but in a dirty way, a rough way, a way in which they could not but stumble; such was the way of idolatry (such is the way of all iniquity—it is a false way, it is a way full of stumbling-blocks) and yet this way they chose to walk in and lead others in.