(15) I will make waste mountains . . .--The whole description is symbolic, and points to the subjugation of the heathen nations, the "rivers" and "pools" probably representing the kingdoms of the Tigris and Euphrates (Isaiah 8:7). All this seems a purely destructive work, but through it all mercy and truth are working, and a way is being opened for the return of Israel, in painting which, as elsewhere, the literal melts into the spiritual, as in a dissolving view. (See Note on Isaiah 40:4.) "These things" include the whole work of judgment and of mercy.

Verse 15. - I will make waste mountains and hills. The result of God's "stirring up his jealousy," and giving a free vent to his feelings, will be the destruction of the great and mighty ones of the earth (comp. Isaiah 2:14). These are probably, in this place, the Babylonian kings and nobles. Dry up all their herbs; i.e. turn Babylonia, temporarily, into a desert. Make the rivers islands, and dry up the pools. Invert the established order of things - turn the rivers into dry land, and empty the reservoirs. There is, perhaps, some allusion to those dealings with the river-beds, which the Greek historians ascribe to Cyrus (Herod., 1:189, 191; Xen., 'Cyrop.,' 7:5, § 10), and which are not disproved by the fact that the one native account of the capture of Babylon by Cyrus, which has come down to us, makes no mention of them.

42:13-17 The Lord will appear in his power and glory. He shall cry, in the preaching of his word. He shall cry aloud in the gospel woes, which must be preached with gospel blessings, to awaken a sleeping world. He shall conquer by the power of his Spirit. And those that contradict and blaspheme his gospel, he shall put to silence and shame; and that which hinders its progress shall be taken out of the way. To those who by nature were blind, God will show the way to life and happiness by Jesus Christ. They are weak in knowledge, but He will make darkness light. They are weak in duty, but their way shall be plain. Those whom God brings into the right way, he will guide in it. This passage is a prophecy, and is also applicable to every believer; for the Lord will never leave nor forsake them.I will make waste mountains and hills,.... Kingdoms, greater and lesser; kings and governors, as Jarchi interprets it; and so Kimchi understands it of the kings of the nations; by them are meant the emperors of Rome, and their governors under them, that set themselves against Christ and his Gospel, but were overcome by him; these mountains and hills became a plain before him: "every mountain and island were moved out of their places, and the kings of the earth, and the great men, &c. hid themselves in the dens, and in the rocks of the mountains, and called upon them to fall on them, and hide them from the wrath of the Lamb", Revelation 6:14,

and dry up all their herbs; the common people, and common soldiers that were with them, and on their side; comparable, for smallness, weakness, and number, to the grass of the mountains and hills:

and I will make the rivers islands, and dry up the pools; extirpate all the remains of idolatry, rivers and fountains being sacred with the Heathens, as mountains and hills were places where sacrifices were offered to idols. Unless by it rather should be meant, that the Lord would remove all impediments out of the way of his people, or which were obstacles of their conversion; just as he dried up the waters of the Red sea and Jordan, to make way for the people of Israel; to which the allusion may be, and which agrees with the following words.