Romans 15:13 May the God of hope fill you with all joy and peace in believing, so that by the power of the Holy Spirit you may abound in hope.
In the 1950s, a Harvard psychologist named Dr. Curt Richter conducted a now-famous experiment involving rats and buckets of water. At first glance, it was a grim study, but a profound truth about the human spirit was buried within it.
In his initial test, Richter placed rats in water to see how long they could swim before giving up. On average, they lasted just 15 minutes before succumbing to exhaustion. But then something remarkable happened, he added the possibility of hope to see the results.
Just before the rats were about to drown, Richter would reach in, pull them out, dry them off, let them rest, and then return them to the water.
And this time?
They didn’t just swim another 15 minutes.
They lasted hours with one rat that continued to swim for an astonishing 60 hours.
What changed? Richter concluded “the rats quickly learn that the situation is not actually hopeless” and that “after elimination of hopelessness the rats do not die.”
Because they had been rescued once, the rats now believed they might be rescued again—and that hope gave them the strength to endure far beyond what they were capable of before.
Let that settle in your heart for a moment: hope kept them swimming.
If hope can keep a tired rat going for 60 hours, imagine what hope in God can do in your life.
Difficult seasons are inevitable. But the crushing weight of hopelessness is far more dangerous than hardship itself.
Hope doesn’t deny the difficulty — it gives us strength in the middle of it. It lifts our eyes off the storm and fixes them on the Savior. And sometimes, that small flicker of hope is all we need to keep swimming.
That’s why Scripture reminds us that the God of hope is able to fill us with joy and peace as we trust in Him—so that, by the power of the Holy Spirit, we can overflow with hope even in the hardest moments.
Perhaps you feel like you’re treading water, moments from going under. Maybe someone close to you is silently struggling to stay afloat. Never underestimate the power of hope, especially the kind rooted in Yeshua (Jesus). It can carry you further than you ever imagined.
Copyright 1999-2026 Worthy Devotions. This devotional was originally published on Worthy Devotions and was reproduced with permission.
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Isaiah recalls the Exodus as the supreme display of God’s Z’roah, His Arm of glory. Though the people saw Moses raise his staff over the Red Sea, it was not Moses’ power that split the waters. Behind the prophet’s hand was the Arm of the LORD — majestic, glorious, and unstoppable. The sea parted not to honor Moses, but to exalt the Name of the God who sent him. The Red Sea became a stage for God to reveal His glory, so that His Name would echo through generations as the Deliverer of His people.
Jeremiah uttered these words when everything around him looked hopeless. Babylon’s armies surrounded Jerusalem, the city was on the brink of destruction, and yet God told Jeremiah to buy a field as a prophetic sign that restoration would come. The prophet responded in awe: the God who created the heavens and the earth by His outstretched arm (bizroa netuyah) is not bound by human circumstances. The same God who set galaxies in place and boundaries for the seas is the God who still moves to redeem His people. Truly, nothing is too hard for Him.
Isaiah’s words summon one of the most dramatic images of God’s saving power: the Z’roah — the Arm of the LORD — cutting Rahab in pieces and piercing the dragon.
Here, Rahab is not the woman of Jericho but a poetic name for Egypt (Psalm 87:4), often symbolizing arrogant nations and the dark spiritual powers behind them. In Hebrew poetry, Rahab also evokes the sea monster of chaos, a stand-in for the forces that oppose God’s order. To say the Arm “cut Rahab in pieces” is to recall how God shattered Egypt’s pride and broke the grip of the powers that enslaved His people.
Psalm 98 is a victory psalm — a call to lift up a “new song” because the Z’roah, the holy arm of the LORD, has brought decisive triumph. In Hebrew thought, the arm is the active extension of the will, the power that brings intention into reality. To call it “holy” is to declare that it is set apart, dedicated fully to God’s purpose, incapable of corruption. The psalmist celebrates that salvation is not a hidden act, but an open demonstration — God’s righteousness revealed before the eyes of the nations.
This is one of the most intimate revelations of the Z’roah in Scripture. God looks for a human intercessor but finds none. No man can bridge the gap. So His own Arm accomplishes the work. In Hebrew, v’tosha lo zeroa — “His arm saved for Him” — reveals that salvation originates from within God Himself, not from any outside help. Isaiah adds that His own righteousness sustained Him — it upheld His resolve to save — and His fury upheld Him, a holy passion that would not rest until justice was accomplished.
To “bare” the arm means to roll up the sleeve and reveal the full readiness for action. In Isaiah’s prophecy, this is a global unveiling — no longer hidden, the Z’roah is on display for all nations to witness. This speaks directly of Yeshua’s (Jesus’) public ministry and, ultimately, His crucifixion.
The Hebrew phrase “z’roah moshel lo” paints the picture of an arm that governs with both strength and care. The same Z’roah that brought Israel out of Egypt in power now establishes righteous order and sustains His people in love. Deliverance without rulership is incomplete; the Redeemer becomes the King — and the King rules as a Shepherd. The Arm does not act independently but moves in perfect submission to the Head, carrying out the will of the Father.