Isaiah 40 Explanation

Isaiah 40 is the opening of a new section in the book of Isaiah, and it is where many readers first meet a message of comfort after judgment. It announces that God’s people have suffered enough, that a way is being prepared for the Lord to return to them, and that the God who made the universe is both mighty and tender toward the weak. People search for an Isaiah 40 explanation because the chapter moves quickly from consolation to a sweeping view of God’s power, then back to the personal promise that those who wait on him will be strengthened.

Isaiah 40 Summary

The chapter opens with a double command to speak comfort to Jerusalem. The voice in the text tells the people that their period of hardship is finished and their sin has been pardoned. A second voice calls for a road to be prepared in the wilderness for the coming of the Lord, with the valleys raised, the mountains lowered, and the crooked ways made straight. The glory of the Lord is then said to be revealed to all people together.

From there the chapter turns to human frailty. Every person is compared to grass that withers under the breath of the Lord, while his word stands forever. The messengers of good news are told to lift their voices and announce that God is coming with power and reward. The chapter then pictures him as a shepherd who gathers the lambs and carries them close.

The second half moves into a series of questions about God’s greatness. No one measured the waters, weighed the mountains, or advised the Lord, and the nations are as small as a drop in a bucket. This leads to a challenge against making idols, since nothing made by human hands can compare with the one who sits above the earth and stretches out the heavens. The chapter ends by asking why Israel would think its way is hidden, and then promises that the weary are given strength while those who wait on the Lord will rise on wings like eagles.

Background and Setting

The book of Isaiah is traditionally attributed to the prophet Isaiah, who ministered in Jerusalem during the second half of the eighth century BC. Many scholars recognize that the book contains material from different periods, and chapter 40 onward is often linked to the time of exile in Babylon, roughly the late sixth century BC, when the people of Judah faced the loss of their land and temple. Whether one holds to a single author or several, the chapter is read as a message written for a community that had reason to doubt God’s care.

Chapter 40 begins a major shift in the book. The first thirty-nine chapters are dominated by warnings of judgment against Judah and the surrounding nations, along with the threat of invasion. Starting here, the tone changes to consolation and restoration, and the prophet speaks as one who sees the end of hardship already on the horizon. The chapter therefore works as a hinge between the book’s sorrow and its hope.

Isaiah 40 Section by Section

Verses 1-2: The Command to Comfort

1 “Comfort, comfort my people,” says your God. 2 “Speak comfortably to Jerusalem; and call out to her that her warfare is accomplished, that her iniquity is pardoned, that she has received of the LORD’s hand double for all her sins.”

Isaiah 40:1-2 (WEB)

The chapter begins with a repeated command to comfort, directed at God’s people in general and at Jerusalem in particular. The word translated comfort carries the sense of tender reassurance rather than a shallow pat on the shoulder. The message is that the period of warfare is complete and that the penalty for sin has been accepted. Readers often find this a helpful starting point because it places God in the role of the one who initiates healing.

Notice that the message is spoken to Jerusalem as a person who can receive good news. The prophet is not told to scold or threaten but to speak to the heart of the city. This pattern of tender address runs through the chapter and shapes how the rest of the material should be heard.

Verses 3-5: The Way Prepared in the Wilderness

3 The voice of one who calls out, “Prepare the way of the LORD in the wilderness! Make a level highway in the desert for our God. 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. 5 The LORD’s glory shall be revealed, and all flesh shall see it together; for the mouth of the LORD has spoken it.”

Isaiah 40:3-5 (WEB)

A voice calls for a road to be made ready in the desert, a picture of clearing the way for a royal procession. In the ancient world, roads were prepared before a king arrived, and rough terrain was leveled so his entourage could pass. The image suggests that the Lord himself is coming to his people and that nothing will hinder his arrival. Mountains are lowered and valleys raised so that all things become level.

The section ends with the promise that the glory of the Lord will be seen by all flesh together. The shared viewing matters, because it means the revelation of God’s presence is not reserved for a small group but is public and unavoidable. The reason given is that the mouth of the Lord has spoken, so the promise rests on his word rather than on human plans.

Verses 6-8: Grass, Flowers, and the Enduring Word

6 The voice of one saying, “Cry!” One said, “What shall I cry?” “All flesh is like grass, and all its glory is like the flower of the field. 7 The grass withers, the flower fades, because the LORD’s breath blows on it. Surely the people are like grass. 8 The grass withers, the flower fades; but the word of our God stands forever.”

Isaiah 40:6-8 (WEB)

The voice tells someone to cry out, and the question is asked what should be proclaimed. The answer is that all flesh is like grass and its glory like a flower of the field. Human strength, beauty, and achievement are fragile before the breath of the Lord. This is an honest picture of mortality, but it is not meant to crush. It sets up a contrast between what fades and what lasts.

The word of our God stands forever. Readers can take comfort in the fact that human life is short while God’s promises remain. Many find that this verse steadies them when the things they depended on seem to be withering. The emphasis falls on the reliability of God’s word rather than on the frailty of people for its own sake.

Verses 9-11: The Good News and the Faithful Shepherd

9 You who tell good news to Zion, go up on a high mountain. You who tell good news to Jerusalem, lift up your voice with strength. Lift it up. Don’t be afraid. Say to the cities of Judah, “Behold, your God!” 10 Behold, the Lord the LORD will come as a mighty one, and his arm will rule for him. Behold, his reward is with him, and his recompense before him. 11 He will feed his flock like a shepherd. He will gather the lambs in his arm, and carry them in his bosom. He will gently lead those who have their young.

Isaiah 40:9-11 (WEB)

Messengers are told to climb a high mountain and announce to the cities of Judah that God is here. The task is to lift up the voice and not to be afraid. The announcement is that the Lord God will come with might and that his reward is with him. This is good news meant to be shared publicly, with courage.

The chapter then describes God as a shepherd who feeds his flock, gathers the lambs into his arms, and gently leads the mothers with their young. The image is one of tender strength. Many readers find in it a picture of how God treats those who are most vulnerable, and it becomes a foundation for the later promise of renewed strength.

Verses 12-17: No One Measures the Lord

12 Who has measured the waters in the hollow of his hand, and marked off the sky with his span, and calculated the dust of the earth in a measuring basket, and weighed the mountains in scales, and the hills in a balance? 13 Who has directed the LORD’s Spirit, or has taught him as his counselor? 14 Who did he take counsel with, and who instructed him, and taught him in the path of justice, and taught him knowledge, and showed him the way of understanding?

Isaiah 40:12-14 (WEB)

A series of questions follows, asking who has measured the waters in the hollow of his hand, marked off the heavens with a span, or weighed the mountains on scales. The answer implied is that no one has. The questions are not meant to be answered by the reader but to make the point that God alone holds the created order in his care and understands it completely.

The section then places the nations next to God and finds them as small as a drop in a bucket. The point is not that people do not matter but that no earthly power can rival the one who made all things. Readers are invited to measure their worries and their enemies against the size of the Creator.

Verses 18-20: The Folly of Making Idols

18 To whom then will you liken God? Or what likeness will you compare to him? 19 A workman has cast an image, and the goldsmith overlays it with gold, and casts silver chains for it. 20 He who is too impoverished for such an offering chooses a tree that will not rot. He seeks a skillful workman to set up a carved image for him that will not be moved.

Isaiah 40:18-20 (WEB)

The prophet asks to whom God can be compared, and then describes a craftsman casting an image, overlaying it with gold, and making silver chains for it. The description is pointed. A carved object made by human hands cannot be the God who stretches out the heavens. The mockery here is meant to show the emptiness of worship that trusts in something a person has made.

Modern readers may recognize the same temptation in a different form, whenever a career, a possession, or a reputation takes the place that belongs to God alone. The section calls the reader back to the question of who God truly is and what it means to honor him in his greatness.

Verses 21-24: The One Enthroned Above the Earth

21 Haven’t you known? Haven’t you heard? Haven’t you been told from the beginning? Haven’t you understood from the foundations of the earth? 22 It is he who sits above the circle of the earth, and its inhabitants are like grasshoppers; who stretches out the heavens like a curtain, and spreads them out like a tent to dwell in; 23 who brings princes to nothing; who makes the judges of the earth like meaningless.

Isaiah 40:21-23 (WEB)

The reader is asked whether they have not known or heard what has been told from the beginning. The chapter appeals to the foundations of the earth and to the one who sits above its circle. Earthly rulers appear like grasshoppers in comparison, and the heavens are described as a curtain or tent that God stretches out.

The verses that follow describe princes being brought to nothing and judges becoming meaningless, because all human authority rests under God’s rule. This does not deny that leaders have real responsibility, but it places them within a larger story in which God alone holds final power.

Verses 25-26: To Whom Will You Liken Me?

25 “To whom then will you liken me? Who is my equal?” says the Holy One. 26 Lift up your eyes on high, and see who has created these, who brings out their army by number. He calls them all by name. by the greatness of his might, and because he is strong in power, Not one is lacking.

Isaiah 40:25-26 (WEB)

The Holy One asks to whom he can be compared. He invites the people to lift up their eyes and see who created the stars and calls them out by number and by name. The lesson is that the one who orders the heavens knows each thing he has made and that none is lost. The point of looking up is to recover a right sense of God’s size and care.

Verses 27-31: Strength for the Weary

27 Why do you say, Jacob, and speak, Israel, “My way is hidden from the LORD, and the justice due me is disregarded by my God?” 28 Haven’t you known? Haven’t you heard? The everlasting God, the LORD, The Creator of the ends of the earth, doesn’t faint. He isn’t weary. His understanding is unsearchable. 29 He gives power to the weak. He increases the strength of him who has no might.

Isaiah 40:27-29 (WEB)

The chapter turns to the complaint that Israel’s way is hidden from the Lord and that God has disregarded their cause. The reply is that the everlasting God does not faint or grow weary, and his understanding cannot be searched out. He gives power to the weak and increases strength for those who have none. This is a direct answer to the doubt of the people.

The chapter closes with a promise that those who wait for the Lord will renew their strength. They will mount up with wings like eagles, run without growing weary, and walk without fainting. This verse is among the best known in the Bible, and it gives many believers a steady hope when their own energy has run out.

But those who wait for the LORD will renew their strength. They will mount up with wings like eagles. They will run, and not be weary. They will walk, and not faint.

Isaiah 40:31 (WEB)

Key Themes in Isaiah 40

• Comfort after hardship: The chapter opens by declaring that the people’s suffering has reached its end and that their sins have been pardoned.
• The frailty of humanity and the permanence of God’s word: Human life is like grass that fades, while the promises of God stand forever.
• God’s incomparable greatness: No measurement, counsel, or image can match the one who created and governs the universe.
• The shepherd’s care: The Lord gathers the weak and gently leads those who are most vulnerable.
• Renewed strength for the weary: Those who wait on the Lord are promised fresh power to rise, run, and walk without giving out.

Lessons From Isaiah 40 for Today

Consider a parent sitting at the kitchen table late at night, worried about a child who has stopped speaking to them. Isaiah 40 begins with an invitation to speak tenderly, and that pattern can shape how we talk to people who are hurting. The chapter shows that comfort is not the same as denying difficulty. It names the hardship, announces that it will not last forever, and points to a God who is near.

Think of someone who has just lost a job and feels that their life is shrinking to nothing. The reminder that grass withers and flowers fade does not mean their worth is gone. It means their confidence should rest on the word of God rather than on their current standing. The chapter gives a way to hold both the reality of loss and the steadiness of God’s promises.

Imagine a student in a hospital waiting room, exhausted after days of uncertainty, unable to pray in full sentences. The promise that God gives strength to the weak and that those who wait on him will be renewed speaks directly to that moment. Waiting is not wasted time when it is spent turning toward the one who does not faint or grow weary.

Questions for Reflection

• Where in your life do you most need to hear the command to speak comfort, and who might you speak it to this week?
• What things in your life feel like grass that withers, and how does the word of God that stands forever change how you see them?
• In what ways do you find yourself making a smaller god, one that you can measure, control, or carve to suit your expectations?
• What would it look like to wait on the Lord in a current season of weariness, and what might renewed strength look like for you?

A Prayer From Isaiah 40

Lord, you are the one who speaks comfort to your people and who makes a way in the wilderness. I bring you the places in my life where I feel worn down and fragile, like grass that cannot stand against the wind. Remind me that your word stands forever and that you know each thing you have made, including me. Teach me to measure my fears against your greatness rather than the other way around. Gather me close the way a shepherd gathers the lambs, and give strength to the parts of me that have none left. Help me to wait on you with patience and expectation, trusting that you will renew what I cannot restore by myself. Amen.

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