Isaiah 40:31 Exposition and Application to Waiting on the Lord

Isaiah 40:31, in the New American Standard Bible (NASB), states: "Yet those who wait for the LORD Will gain new strength; They will mount up with wings like eagles, They will run and not get tired, They will walk and not become weary" ^[1]. This verse offers a profound message of hope and endurance to those who trust in God.

This passage is situated within the larger literary context of Isaiah 40, which marks a significant shift in the book of Isaiah. Chapters 1-39 primarily contain messages of judgment against Judah and other nations, while chapters 40-66 focus on themes of comfort, restoration, and hope for Israel ^[7]. Isaiah 40 opens with a call to "Comfort, O comfort My people," proclaiming the end of their warfare and the pardon of their iniquity (Isaiah 40:1-2). The chapter then describes God's incomparable greatness and power, contrasting it with the weakness of humanity and the futility of idols (Isaiah 40:12-26). The prophet questions why Israel would claim their way is hidden from the Lord or that their justice is disregarded by God (Isaiah 40:27). Isaiah 40:28-31 directly addresses this by reminding the people of God's eternal nature, His unfailing strength, and His ability to empower the weary. The passage immediately preceding verse 31 emphasizes that God "gives strength to the weary, And to him who lacks might He increases power" (Isaiah 40:29). Even youths grow weary and stumble, but those who wait on the Lord will be renewed ^[1].

Historically, the book of Isaiah is traditionally attributed to the prophet Isaiah, who ministered in Judah during the reigns of Uzziah, Jotham, Ahaz, and Hezekiah, roughly from 740 to 687 BCE. The messages in Isaiah 40-66 are often understood as being addressed to the exiles in Babylon, offering them comfort and assurance of future deliverance and restoration ^[7]. The context of exile and the longing for return would have made the promise of renewed strength and divine intervention particularly poignant for the original audience.

Key terms in Isaiah 40:31 carry significant weight. The phrase "wait for the LORD" (קָוֹה לַיהוָה, qavah Yahweh) is central. This "waiting" is not passive idleness but involves active trust, hope, and longing for God's redemption ^{[4, 6]}. It implies submission, prayer, and faith ^[4]. The Tyndale House commentary notes that "trust in the Lord" is an equivalent concept, cross-referencing other passages like Isaiah 33:2 and 49:23 ^[3]. This waiting is an expression of commitment to God, going beyond mere lip service ^[6].

The promise that they "will gain new strength" (יַחֲלִיפוּ כֹחַ, yachalifu koach) signifies a renewal or exchange of strength. This strength is not inherent but is received from God. The imagery that follows illustrates this renewal: "They will mount up with wings like eagles, They will run and not get tired, They will walk and not become weary" ^[1]. The image of "eagles" (נְשָׁרִים, nesharim) is a powerful biblical metaphor for rescue and divine care. It evokes the Exodus event, where God carried Israel "on eagles' wings" (Exodus 19:4; Deuteronomy 32:10-12) ^[3]. The eagle's ability to soar effortlessly on thermals, seemingly without tiring, provides a vivid picture of sustained, divinely-empowered endurance. The progression from mounting up like eagles to running without weariness and finally walking without becoming faint suggests different levels of exertion, all sustained by God's strength. Even in the most mundane and prolonged efforts ("walk and not become weary"), God provides endurance.

One major exegetical decision revolves around the nature of "waiting." As noted, it is not a passive state. Abraham Ibn Ezra, a medieval Jewish commentator, interprets anthropomorphic language in Isaiah, such as God "waiting" (Isaiah 30:18), as a figure of speech ^[2]. Similarly, human waiting for God is an active posture of expectation and reliance. The Tyndale House commentary on Isaiah 8:17, which uses similar language ("I will wait for the Lord... I will put my hope in him"), explains that this waiting requires submission, prayer, hope, and faith, leading to a quiet spirit and inner strength ^[4]. This active waiting is contrasted with the impatience and self-reliance that often characterize human responses to difficult circumstances.

The range of interpretations for Isaiah 40:31 consistently emphasizes the transformative power of trusting in God. The promise of renewed strength is understood as both physical and spiritual. The imagery of the eagle is particularly rich. Beyond the Exodus connection, Psalm 103:5 also speaks of God renewing one's youth "like the eagle's," suggesting vitality and rejuvenation ^[3]. The ability to "mount up" implies rising above earthly troubles and gaining a divine perspective. The subsequent promises of running and walking without weariness assure believers of sustained endurance through all of life's challenges, whether intense or prolonged.

This passage has functioned significantly in Christian tradition as a source of comfort and encouragement, particularly during times of trial or uncertainty. It underscores the theological principle that human strength is finite, but God's strength is inexhaustible and available to those who depend on Him. The concept of "waiting on the Lord" is a recurring theme throughout the Psalms and prophetic literature, emphasizing patience, trust, and reliance on God's timing and provision ^{[4, 6]}. For instance, Isaiah 26:8 states, "Indeed, while following the way of Your judgments, O LORD, We have waited for You eagerly; Your name, even Your memory, is the desire of our souls" ^[6]. This demonstrates that waiting is tied to obedience and a deep longing for God Himself.

The passage also highlights God's character as a shepherd who cares for His people (Isaiah 40:11) ^[5]. Just as a shepherd gently leads his flock, God provides for and sustains those who trust in Him. The contrast between human frailty and divine power is a foundational theme in Isaiah 40, culminating in the assurance that God empowers the weak. Idolaters fail to discern God's true nature, but the godly understand and see His hand in redemption ^[7]. This understanding fosters the trust necessary for waiting on the Lord and experiencing the promised renewal of strength. The ultimate fulfillment of such promises is often seen in the broader narrative of God's redemptive plan, which includes both exile and restoration ^[7].