Passage
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.
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.
Isaiah 41:13 For I, Jehovah thy God, will hold thy right hand, saying unto thee, Fear not; I will help thee.
Isaiah 41:14 Fear not, thou worm Jacob, and ye men of Israel; I will help thee, saith Jehovah, and thy Redeemer is the Holy One of Israel.
Isaiah 41:15 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.
Isaiah 41:16 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 41:17 The poor and needy seek water, and there is none, and their tongue faileth for thirst; I, Jehovah, will answer them, I, the God of Israel, will not forsake them.
The verse centers on "behold", "thee", "sharp", "threshing", "instrument", "having", "teeth", and "thou". It is saying that the verse draws attention to "behold" and "thee", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 14's "Fear not thou worm Jacob and ye..." into verse 16's "Thou shalt winnow them and the wind...", so "behold" and "thee" belong inside that flow. In Isaiah context, the local focus is the Holy One of Israel, judgment and restoration, the servant of the LORD, and Zion's hope.
A plain takeaway is to answer the verse's own emphasis on "behold" and "thee" with trust shaped by these words, not by a vague optimism outside the passage.