Isaiah 42:15 describes God acting with decisive power to clear away whatever stands in the way of his purposes, including mountains, rivers, and the dry ground that sustains life. The verse is not a promise that every hard place will vanish, but a declaration that God is able to reshape the landscape of human history when he chooses. The prophet Isaiah speaks these words for the LORD to the exiles of Judah, and to the wider world, in the middle of a passage about God’s servant and the nations.
I will destroy mountains and hills, and dry up all their herbs. I will make the rivers islands, and will dry up the pools.
Isaiah 42:15 (WEB)
What Isaiah 42:15 Means
The verse uses four strong images. God will destroy mountains and hills, which in the Bible often stand for stubborn strength, pride, or entrenched power. He will dry up their herbs, cutting off the life that grows on them. He will turn rivers into islands and dry up the pools, which means the things people depend on for water and security will be emptied or reshaped. Each image says the same thing: nothing in creation can resist the will of God.
What the verse does not do is give a formula for personal comfort. It describes God’s action on a grand scale, the kind that overturns empires and reorders nations. Readers should be careful not to turn it into a guarantee that every mountain in their own life will be leveled on demand. It teaches us about God’s character and his capacity to act, and it trusts him to use that capacity in his own wise way.
The Context of Isaiah 42:15
Isaiah is traditionally attributed to the eighth-century prophet of Jerusalem, though many scholars see later voices shaping the book. Chapters 40 through 55 are often grouped together and speak to exiles in Babylon, people who had lost their land, temple, and sense of God’s nearness. The chapter opens by introducing God’s servant, who brings justice quietly and faithfully to the nations, and then turns to the LORD as a warrior who will act on behalf of his people.
Just before verse 15, God says he has been silent a long time and now will cry out like a woman in labor. The mountains and rivers are the next stage of that vow. Just after, God promises to lead the blind by unfamiliar paths and turn darkness into light. Read in that setting, verse 15 is not a threat aimed at the exiles but a sign that the same powerful God will clear a road for them through what looks impassable.
Key Phrases in Isaiah 42:15
Isaiah 40:4
Every valley shall be exalted, and every mountain and hill shall be made low. The uneven shall be made level, and the rough places a plain.
(WEB)
This verse, spoken earlier in the same section, describes valleys being raised and mountains made low to prepare a highway for the LORD. It shows the same God reshaping the terrain, but with the purpose of bringing his people home rather than only tearing down.
Isaiah 43:19
Behold, I will do a new thing. It springs out now. Don’t you know it? I will even make a way in the wilderness, and rivers in the desert.
(WEB)
Here God announces that he is doing a new thing and will make a way in the wilderness and rivers in the desert. It pairs well with verse 15 by showing that the power to dismantle obstacles is also the power to create unexpected paths of life.
A Short Prayer From Isaiah 42:15
Lord, you are the one who can move mountains and dry up rivers, and nothing in creation is too strong for you. I bring you the obstacles that feel immovable in my life right now, and I ask you to show me your power in them. Help me to trust your timing and your wisdom when I cannot see the path ahead. Remind me that you are at work even in the places that seem dry and closed. Amen.
