Synopsis of the Books of the Bible, by John Nelson Darby, [1857-62], at sacred-texts.com
Isaiah Chapter 30
The effect of this unbelief is manifested in chapter 30. The people put their trust in man, according to the wisdom of man. They look to Egypt for help, but in vain. This contempt of Jehovah, accompanied by an absolute refusal to hearken to His word, which called on the people to trust quietly in Him, added yet more to their iniquity. God allows the evil, therefore, to go on to the full; but it is in order to give then free course to His grace. Verse 18 (Isa 30:18) is a marvellous testimony to the ways of Jehovah. He allowed the chastisement to be fully accomplished, that nothing might be left for Him but perfect grace. Grace and glory will abound, when Jehovah shall bind up the breach of His people and heal their wound. At the end of the chapter we have the intervention of Jehovah against this last instrument of His chastisements-the rod of chapter 10. The Assyrian is destroyed, and in the place where the rod should fall on him, there shall be only songs of triumph. But Tophet, the fire of Jehovah, was prepared for another also-"for the king." He who shall have assumed that title in Israel shall be consumed also by the indignation of Jehovah.