Isaiah 40:29 Meaning and Explanation
“He giveth power to the faint; and to them that have no might he increaseth strength.”
King James Version (KJV)
Read this verse in context with translation switching:
Read Full Chapter →Exhaustion changes what a person can hear. Grand statements about God's greatness can feel remote to someone who cannot get out of bed. Isaiah 40:29 is where the chapter's argument lands on the body. Having described a God who never tires, the prophet says what that God does with people who do. The verse is short, and it is aimed squarely at depletion.
Two matched promises about God's supply. He hands power to people who have run out, and where there is no strength left at all, he adds more.
The Context of Isaiah 40:29
The closing movement of Isaiah 40 runs from verse 27 to verse 31. Verse 27 quotes Israel's complaint that its way is hidden. Verse 28 responds with a question about the everlasting God, the Creator of the ends of the earth, who never faints or grows weary and whose understanding cannot be searched out. Verse 29 turns that fact into a transaction. Verse 30 admits that even the strongest young people collapse, and verse 31 names the condition under which strength is renewed: waiting on the LORD. The four verses form one argument.
What Does Isaiah 40:29 Mean?
The line is built as a pair, and the second half raises the first. He giveth power to the faint uses a word for those who are drained, worn through by circumstance. To them that have no might he increaseth strength goes further, since increase ordinarily needs an existing amount to work with. Isaiah applies it to people who have nothing to multiply. The grammar carries the sense of an ongoing habit rather than a single event. Both verbs describe what God keeps doing, which makes the verse a statement about his character before it is a promise about our recovery.
Verse 28 had established that God himself never faints. Verse 29 explains what he does with the stamina he never spends. The movement is from an attribute to a distribution, and it answers the complaint of verse 27 in an unexpected way. Israel had claimed to be overlooked; the reply describes God handing out strength precisely where it has run out. This is consistent with how Scripture presents divine power throughout. Manna came to people with empty baskets, and the widow's oil multiplied in vessels she had to borrow. Emptiness is treated as the ordinary starting condition for God's supply.
Paul reports hearing something very close to this line. He describes asking three times for a thorn to be removed and receiving instead the answer that God's strength is made perfect in weakness. Whether or not he had Isaiah 40 in mind, the pattern is identical. Jesus lived it as well, since the Gospels show him tired at a well in Samaria and asleep in a boat during a storm, and they show power going out from him to heal. The God who gives power to the faint entered the condition of the faint, which is why the promise carries weight.
Isaiah 40:29 in the Original Language
ya'ef (יָעֵף), 'faint' -- weary to the point of collapse, drained by effort or hardship. The same root runs through verses 28 to 31, where God is the one who never becomes ya'ef. The verse therefore hands to tired people the very quality God possesses without limit.
Bible Verses Related to Isaiah 40:29
“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.”
- Isaiah 40:28
“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.”
- Isaiah 40:31
“And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me.”
- 2 Corinthians 12:9
“I can do all things through Christ which strengtheneth me.”
- Philippians 4:13
Where Isaiah 40:29 Echoes in Scripture
2 Corinthians 12:9 records the answer Paul received when he asked for relief: God's grace is sufficient, and strength is made perfect in weakness. Isaiah 40:29 states the same principle from the other side, describing what God does rather than what a sufferer learns. Together the two texts describe an economy in which shortage is where the supply shows up. Paul's conclusion, that he would glory in infirmities, follows naturally from Isaiah's sentence.
How to Apply Isaiah 40:29 Today
Caregivers, shift workers, students in a hard term, anyone in a long illness: the verse names a real category and speaks to it. One useful practice is to stop treating tiredness as a spiritual failure. Isaiah puts the faint at the center of a promise rather than at the edge of one. A second practice is asking specifically. Prayers for strength often stay general, and this line invites something concrete about tomorrow morning, the difficult conversation, the last two hours of a shift. God gives power to the faint, which means the request is already welcome before we make it.
Reflection & Prayer
Where have we been apologizing to God for being tired instead of asking him for what tiredness needs? Try the direct request today. A prayer: God who never runs low, we have very little left. Give power where we are faint, and add strength where there is none. We ask plainly, and we trust you to measure out the portion.