Isaiah 41:15-16

15, 16. I will make thee a new… threshing instrument The remnant of Israel, when set free, shall be God’s threshing drag-net (see Isaiah 28:25-29) over opposers and idolaters; a frame of plank shod with rollers, or with stones or iron, here with iron, having teeth, sharpened teeth. All this means spiritual might.

Mountains… hills Opposers of fearful purpose and aspect. These are to be ground to powder, reduced to beggarly weakness through the mighty moral power with which the beggarly, weak remnant of Israel is to become endowed.

Thou shalt fan them The winnowing and the strong wind are put in contrast with God and his renewed people, as regards the once proud and boastful opposers and oppressors.