Isaiah 40:31 is one of the most quoted verses in the Bible and one of the most misunderstood.
It is read at funerals, quoted in times of weariness, and memorized by people who need something to hold onto when life has emptied them of strength.
But the verse is doing far more than offering comfort.
It is making a theological claim about how strength works, where it comes from, and what the person who receives it looks like.
The Verse in Full
“But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint.”
— KJV, Isaiah 40:31
The three images in this verse, mounting up, running, and walking, are not random.
They appear in descending order of intensity, which will matter when we look at what Isaiah was actually promising.
The Context That Makes the Verse Make Sense
Who Was Isaiah Writing To?
Isaiah 40 begins one of the most significant shifts in the entire book.
The preceding chapters had addressed Judah’s sin and warned of coming judgment. Now Isaiah 40 opens with comfort.
“Comfort, comfort my people, says your God. Speak tenderly to Jerusalem, and cry to her that her warfare is ended, that her iniquity is pardoned.”
— ESV, Isaiah 40:1–2
The people receiving this word were exhausted. They had been through national trauma, the threat of Assyrian invasion, the pressure of political alliances that felt necessary but compromised their trust in God, and the long spiritual fatigue of trying to maintain faithfulness under conditions that felt overwhelming.
These were not people facing minor inconvenience. These were people at the end of their rope.
The Build-Up to Verse 31
Isaiah 40 does not rush to the comfort. It builds toward it by establishing who God is.
“Do you not know? Do you not hear? Has it not been told you from the beginning? Have you not understood from the foundations of the earth? It is he who sits above the circle of the earth.”
— ESV, Isaiah 40:21–22“He gives power to the faint, and to him who has no might he increases strength.”
— ESV, Isaiah 40:29“Even youths shall faint and be weary, and young men shall fall exhausted.”
— ESV, Isaiah 40:30
This progression is essential. Isaiah is establishing that even the naturally strong, even the young men who should have reserves, even the healthy and energetic will eventually hit the wall of their own limitation.
And then verse 31 arrives: but they who wait on the Lord.
What “Wait” Actually Means in Hebrew
The Word Qavah
The Hebrew word translated “wait” in Isaiah 40:31 is qavah.
It does not primarily mean passive endurance, sitting quietly until something happens.
Its root meaning is to bind together, to twist into a cord, to intertwine.
It is related to the Hebrew word for hope, tikvah, which appears in Jeremiah 29:11 and which literally means a cord or thread, suggesting something stretched out and held under tension.
Waiting in the biblical sense is not passive resignation. It is an active, directed, sustained orientation of the whole person toward God.
It is the posture of someone who has chosen to remain bound to God, whose hope is threaded into him, who keeps turning back to him rather than resolving the tension by running toward another source of strength.
The Difference Between Biblical Waiting and Human Waiting
When humans wait, they often mean they are doing nothing until something changes.
When Isaiah uses qavah, he means something entirely different: the active, sustained, expectant leaning of the self into God while the answer has not yet arrived.
It involves prayer. It involves the continued practice of trust. It involves refusing to fill the silence with substitutes.
This kind of waiting is not passive. It is possibly the most demanding spiritual posture the Bible describes.
What “Renew Their Strength” Actually Means
The Hebrew Word Chalaph
The word translated “renew” is chalaph, and it has a more specific meaning than the English suggests.
It means to change, to exchange, to put off one thing and put on another.
The person who waits on the Lord does not simply receive more of the strength they already have. They exchange their depleted human strength for something qualitatively different: God’s own energy and capacity working through them.
This is not refueling. It is a transfer.
The exhausted person brings their emptiness to God, and what comes back is not a top-off of the same supply but a different kind of strength altogether.
Why This Matters for the Person Who Is Tired
Many believers try to wait for God while still running on their own reserves.
They are hoping that rest and recovery will restore what exhaustion has taken.
But Isaiah’s promise is more radical. It is not that God gives you a break so you can come back to your own strength refreshed.
It is that God replaces your strength with his. The person who genuinely waits on him does not return to human capacity. They operate from divine capacity.
The Three Images and What They Mean
The order of the three images in verse 31 has been noticed by careful readers for centuries.
Mounting Up With Wings Like Eagles
The first image is the most dramatic: soaring like an eagle.
Eagles do not flap continuously to stay aloft. They locate the rising thermal currents, spread their wings, and allow the invisible upward force to carry them.
The image describes the experience of being carried by God’s power in moments of significant spiritual lift: the experience of prayer or worship or breakthrough, where the soul seems to rise above its ordinary limitations effortlessly.
Running and Not Growing Weary
The second image is the steady pace of sustained effort: running without becoming weary.
This is the daily grind of faithful obedience, the discipline of showing up in prayer, in the Word, in service, in consistency, without burning out.
It describes a sustained output that does not deplete because the supply is coming from outside the person.
Walking and Not Fainting
The third image is the most ordinary and, many commentators have argued, the most significant: walking without fainting.
Walking is the basic pace of daily existence. It is the ordinary Tuesday of a life lived in faith.
The promise that those who wait on the Lord will walk without fainting is the promise that covers the ordinary days when nothing spectacular is happening, the diagnosis is still the same, the prayer has not yet been answered, and the person still has to get up and keep moving.
Not fainting in ordinary walking is harder for most people than soaring in the high moments. Isaiah put it last because it may be the most needed promise.
What This Means Practically for the Waiting Person
Waiting Is Not Doing Nothing
The person who is waiting on the Lord in the Isaiah 40:31 sense is actively praying, actively trusting, actively choosing God as their source rather than alternatives that feel more immediate.
They have not stopped moving. They have rooted their movement in the right source.
The Strength Is Not Your Own
The promise is not that God will help you be stronger. It is that his strength will replace yours.
This means the waiting person does not need to have more discipline, more willpower, or more natural resilience than they currently possess.
They need to bring their emptiness to the right place.
The Eagle Season Is Not the Only Season
Many people want the eagle experience of soaring and feel disappointed when most of life looks like walking.
But Isaiah listed all three because God’s strength sustains all three.
The soaring is real. The running is real. And the walking without fainting is just as much a miracle as mounting up on wings, perhaps more so, because it happens every single ordinary day.
Questions People Ask About Isaiah 40:31
What does “wait on the Lord” mean in Isaiah 40:31?
It comes from the Hebrew qavah, meaning to bind together, intertwine, or hold expectantly. It is an active posture of directed, sustained trust in God rather than passive endurance. The one who waits on the Lord has oriented their entire hope and expectation toward him rather than toward other sources of help.
Why does Isaiah list mounting up before running and walking?
The images appear to move from the most dramatic (soaring) to the most ordinary (walking). Some commentators suggest this reflects a deliberate ordering: spectacular moments of divine uplift, sustained daily faithfulness, and the quiet perseverance of ordinary life. All three are promised to those who wait, covering every dimension of experience.
What does “renew their strength” mean in Hebrew?
The Hebrew word is chalaph, meaning to exchange or replace rather than simply to top up. Those who wait on the Lord do not simply recover their own strength. They exchange depleted human strength for God’s strength, a qualitatively different supply that operates through them rather than originating from them.
Is Isaiah 40:31 a promise for everyone?
The verse specifies “they that wait upon the LORD,” which establishes a condition. The promise is directed to those who actively orient themselves toward God in the posture of qavah. It is not a general spiritual principle that applies to everyone regardless of their relationship with God.
What is the difference between mounting up on wings and walking without fainting?
Mounting up describes dramatic, elevated spiritual experiences where God’s power is felt acutely. Walking without fainting describes the ordinary daily faithfulness where God’s strength sustains what would otherwise lead to collapse. Both are genuine expressions of waiting on the Lord, and both are equally promised in the verse.
A Prayer for the Person Who Is Waiting
Father, I have been running on my own for longer than I should have.
I have been trying to find reserves that were never there.
I have been waiting, but I have been waiting for circumstances to change rather than waiting on you.
Teach me the difference.
Let me bring this emptiness to you, not as a complaint, but as an offering.
Here is what I have left.
It is not much.
Exchange it.
Give me what Qavah promises: the strength that comes from being genuinely bound to you, threaded into you, orienting everything I have toward you as the source.
And when I do not soar, let me run.
And when I cannot run, let me walk.
And when I can barely walk, let me not faint.
Because that is also the promise.
In Jesus’ name, amen.
