Isaiah 42:15

I will make waste mountains -This verse denotes the utter desolation which God would bring upon his foes in his anger. The meaning of this part of the verse is, that he would spread desolation over the hills and mountains that were well watered and laid out in gardens and orchards. It was common to plant vineyards on the sides of hills and mountains; and indeed most of the mountains of Palestine and adjacent regions were cultivated nearly to the top. They were favorable to the culture of the vine and the olive; and by making terraces, the greater portion of the hills were thus rescued for purposes of agriculture.