Have you not known? Have you not heard? The LORD is the everlasting God, the Creator of the ends of the earth. He does not faint or grow weary; his understanding is unsearchable.
English Standard Version (ESV)
The prophet challenges the people by asking if they've forgotten that God, the Creator of everything, doesn't experience the limitations of fatigue or weariness that humans do. This isn't just about His power; it highlights that His "understanding is unsearchable" means He possesses a wisdom so vast it's beyond our comprehension, implying we shouldn't expect to grasp all His ways or question His care for us.
Have you not known? Have you not heard? The LORD is the everlasting God, the Creator of the ends of the earth. He does not faint or grow weary; his understanding is unsearchable.
English Standard Version (ESV)
The prophet is addressing the people of Israel, who are complaining that God has forgotten them and their troubles. He challenges them to recall all they know and have heard about God's character and past actions. This verse directly precedes the promise that God gives strength to the weary and renews their strength, emphasizing that God's infinite power and wisdom are the reason they can depend on Him even when their own understanding fails.
Ever feel like God doesn't see your struggles? Isaiah calls out the Israelites for forgetting who God truly is, especially in hard times. It's a powerful reminder for us too.
The Prophet's Question
The chapter opens with God's people feeling forgotten: "My way is hidden from the LORD; my right is disregarded by my God" (Isaiah 40:27). Isaiah doesn't just accept their despair; he challenges it directly with a series of questions: "Have you not known? Have you not heard?" These aren't just rhetorical questions; they are an invitation to remember.
Why Remembering Matters
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Feeling exhausted by life's demands? We often feel our own limitations. But Isaiah points us to a God who is the ultimate source of strength – because of who He is.
Beyond Human Limits
The verse contrasts God's nature with human frailty. We faint, we grow weary, our understanding has limits. But God?
Understand the original words
olam · Hebrew Adjective
A term expressing God's eternal nature, existing outside of linear time, having no beginning or end.
tebunah · Hebrew Noun
Refers to the divine capacity for deep, perfect, and incomprehensible wisdom; it implies God's exhaustive knowledge and perfect discernment.
This passage speaks into the profound despair of the Babylonian exile, reminding a defeated people that their God is not diminished by their circumstances but is the eternal, all-powerful Creator. The prophet uses these grand attributes to combat their feelings of abandonment and hopelessness, urging them to recall their history and trust in God's enduring strength and wisdom.
c. 740 BC
Prophetic Ministry of Isaiah
Isaiah begins his prophetic ministry during a time of significant political upheaval and the looming threat of the Assyrian Empire. He delivers messages of judgment and hope to the kingdoms of Judah and Israel.
c. 701 BC
Assyrian Invasion of Judah
The Assyrian king Sennacherib invades Judah, conquering many cities and besieging Jerusalem. This event profoundly impacts the people's faith and their understanding of God's protection.
c. 605 BC
First Babylonian Deportation
King Nebuchadnezzar of Babylon begins deporting segments of the Judean population to Babylon, including Jehoiakim and notable individuals like Daniel. This marks the beginning of the Babylonian exile.
586 BC
Destruction of Jerusalem and Temple
Babylonian forces destroy Jerusalem and its magnificent Temple, shattering the hearts of the Judean people and marking the full extent of the exile.
c. 540 BC— this verse
Isaiah's Call to Comfort the Exiles
During the Babylonian exile, the prophet (traditionally identified as Second Isaiah) delivers messages of comfort and future restoration. This passage is part of that larger prophetic context.
539 BC
Persian Conquest of Babylon
Cyrus the Great of Persia conquers Babylon, paving the way for the return of the Jewish exiles to Jerusalem.
538 BC
Decree of Cyrus and Return of Exiles
Cyrus issues a decree allowing the Jewish exiles to return to their homeland and rebuild the Temple, fulfilling prophecies and marking a new era.
This passage directly echoes Isaiah's theme of God's unsearchable understanding by detailing how God knows all our thoughts and actions, even before we speak them.
Job 11:7-10These verses from Job also grapple with the incomprehensibility of God's wisdom, reinforcing Isaiah's assertion that God's understanding is beyond human searching.
Romans 11:33-34The Apostle Paul directly quotes and reflects on Isaiah's point about God's unsearchable ways and understanding when contemplating God's sovereign plan for Israel and the Gentiles.
Isaiah 40:31Immediately following this verse, Isaiah describes the *result* of God's strength and infinite resources: He gives strength to the weary, showing the practical outworking of His unwearying nature for His people.
barnesIsaiah 40:28: "Hast thou not known? hast thou not heard, that the everlasting God, the LORD, the Creator of the ends of the earth, fainteth not, neither is weary? there is no searching of his understanding."
Hast thou not known? - This is the language of the prophet reproving them for complaining of being forsaken and assuring them that God was faithful to his promises. This argument of the prophet, which continues to the close of the chapter, comprises the main scope of the chapter, which is t…
pulpitIsaiah 40:28: "Hast thou not known? hast thou not heard, that the everlasting God, the LORD, the Creator of the ends of the earth, fainteth not, neither is weary? there is no searching of his understanding."
Verse 28. - Hast thou not known? Complaining Israel is bidden to stay itself upon God, as (1) everlasting; (2) the Creator; (3) unwearied; (4) unsearchable; and is then further consoled by the promise that God will give them strength to endure; support them, refresh them, and, as it were, r…
The prophet challenges the people by asking if they've forgotten that God, the Creator of everything, doesn't experience the limitations of fatigue or weariness that humans do. This isn't just about His power; it highlights that His "understanding is unsearchable" means He possesses a wisdom so vast it's beyond our comprehension, implying we shouldn't expect to grasp all His ways or question His care for us.
The prophet is addressing the people of Israel, who are complaining that God has forgotten them and their troubles. He challenges them to recall all they know and have heard about God's character and past actions. This verse directly precedes the promise that God gives strength to the weary and renews their strength, emphasizing that God's infinite power and wisdom are the reason they can depend on Him even when their own understanding fails.
The prophet is addressing the people of Israel, who are complaining that God has forgotten them and their troubles. He challenges them to recall all they know and have heard about God's character and past actions. This verse directly precedes the promise that God gives strength to the weary and renews their strength, emphasizing that God's infinite power and wisdom are the reason they can depend on Him even when their own understanding fails.
"Have you not known? Have you not heard? The LORD is the everlasting God, the Creator of the ends of the earth. He does not faint or grow weary; his understanding is unsearchable." — The prophet challenges the people by asking if they've forgotten that God, the Creator of everything, doesn't experience the limitations of fatigue or weariness that humans do. This isn't just abou…
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Last reviewed October 2026