Isaiah 40:6 says that human life and human achievement are brief and fragile, like grass that dries up and flowers that fade. The verse is a voice calling out in the middle of a message of comfort, reminding the listener that people do not last, while God’s word does. It is spoken by a voice in the prophecy of Isaiah, addressed to the exiled people of Judah who needed to hear that their hope rested on something more durable than their own circumstances.
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.
Isaiah 40:6 (WEB)
What Isaiah 40:6 Means
The verse opens with a summons. A voice tells someone to “cry out,” and when the speaker asks what to proclaim, the answer is a message about mortality. The point is not that people are worthless. It is that human strength, beauty, and pride are temporary, like the green of spring grass that turns brown in the heat.
The comparison is concrete. “All flesh” means every human being, and “all its glory” refers to whatever people are proud of: their strength, their reputation, their success. Each of these is compared to a wildflower in the field, lovely for a season and then gone. The verse does not promise that our lives will be easy or that our efforts are pointless. It simply tells the truth about what lasts and what does not.
What the verse does not say is that God is distant or uninterested in people. Its honesty about frailty sets up the contrast that follows in the next verse, where the word of God is said to stand forever. The verse is a realistic assessment, not a dismissal of human life.
The Context of Isaiah 40:6
Isaiah 40 begins a new major section of the book, often called the “Book of Comfort,” which speaks to a people facing exile and the loss of their homeland and temple. The book is traditionally attributed to the prophet Isaiah, though many scholars see chapters 40 to 66 as the work of a later writer or school of writers who carried his message forward. The audience is the exiled community of Judah, who needed reassurance that God had not abandoned them.
Just before verse 6, a voice calls for a highway to be prepared in the wilderness for the coming of the LORD, with valleys raised and mountains lowered. Just after, the reader is told that the word of God stands forever. The verse sits between the promise of God’s arrival and the assurance of God’s permanence, so it is best read as a pause that makes the comfort stronger. Human weakness is named so that God’s faithfulness can be seen as the solid ground beneath it.
Key Phrases in Isaiah 40:6
Psalm 103:15-16
15 As for man, his days are like grass. As a flower of the field, so he flourishes. 16 For the wind passes over it, and it is gone. Its place remembers it no more.
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This psalm uses a similar image of human life as grass and a flower that the wind passes over and is gone. It pairs the brevity of people with the steady love of the LORD, which lasts from everlasting to everlasting.
1 Peter 1:24-25
24 For, “All flesh is like grass, and all of man’s glory like the flower in the grass. The grass withers, and its flower falls; 25 but the Lord’s word endures forever.” This is the word of Good News which was preached to you.
(WEB)
Peter quotes this same Isaiah passage to show that the word of the Lord endures forever, and that the good news preached to believers is the imperishable seed that gives new life.
A Short Prayer From Isaiah 40:6
Lord, you know how quickly my strength fades and how easily my pride goes hollow. Some days I feel like the grass that dries in the heat, and I am tempted to measure myself by what I can achieve or how I am seen. Teach me to remember how short my life is, and let that memory make me humble rather than afraid. Help me rest my hope in your word, which stands forever, even when everything around me seems to change. Amen.
