Charles Spurgeon Commentary Isaiah 41:15-16

"Behold, I have made thee [to be] a new sharp threshing instrument having teeth; thou shalt thresh the mountains, and beat them small, and shalt make the hills as chaff. Thou shalt winnow them, and the wind shall carry them away, and the whirlwind shall scatter them; and thou shalt rejoice in Jehovah, thou shalt glory in the Holy One of Israel." — Isaiah 41:15-16 (ASV)

You shall thresh the mountains, and beat them small, and shall make the hills as chaff. You shall fan them, and the wind shall carry them away, and the whirlwind shall scatter them: and you shall rejoice in the LORD, and shall glory in the Holy One of Israel.

Truly, when mountains are beaten into chaff, and blown away with the winnowing fan, there is room for rejoicing and magnifying God. If there were no difficulties, there would be no victories. If we had no trials, we should have no tests of Jehovah's strength; but out of our afflictions we get our joys. The deeper our sorrows, the higher our exultations when God helps us through them.