What does the Bible say about strength?
The Bible says real strength comes from God, not ourselves. Those who wait on the Lord "renew their strength" (Isaiah 40:31), believers can do all things through Christ who strengthens them (Philippians 4:13), and the Lord is called "my strength and my shield" (Psalm 28:7).
The Bible treats strength less as raw human capacity and more as a gift received from God and exercised in dependence on him. Scripture is honest that human strength runs out — youths faint, the strong stumble, and courage fails — yet it insists that those who wait on the Lord renew their strength. From Isaiah 40:31 to Philippians 4:13 to Psalm 28:7, the consistent pattern is that God supplies power for endurance, courage for obedience, and steadiness in weakness, so that his strength is displayed rather than ours.
Biblical strength is God's power supplied to dependent people, not self-confidence — it is renewed by waiting on the Lord and is most visible in weakness.
Human strength has limits — God's does not
Scripture never flatters human power. Isaiah writes that "even youths shall faint and be weary, and young men shall fall exhausted" (Isaiah 40:30). That is not pessimism; it is the setup for the promise that follows: "but they who wait for the LORD shall renew their strength; they shall mount up with wings like eagles; they shall run and not be weary; they shall walk and not faint" (Isaiah 40:31). The verb translated "renew" carries the sense of exchanging — trading depleted strength for God's inexhaustible strength. The condition is waiting, which in Hebrew thought means expectant trust rather than passive delay.
The same logic appears in the Psalms. "The LORD is my strength and my shield; in him my heart trusts, and I am helped" (Psalm 28:7). Strength here is relational: it is not a quality David possesses but a Person he leans on. Psalm 46:1 names God "our refuge and strength, a very present help in trouble," and Psalm 73:26 admits the honest reality — "my flesh and my heart may fail, but God is the strength of my heart and my portion forever."
Strength for obedience and courage
A large share of the Bible's strength language is spoken to people facing a task too big for them. God commands Joshua three times, "Be strong and courageous," and grounds the command in his presence: "for the LORD your God is with you wherever you go" (Joshua 1:9). Courage is not self-generated bravado; it is the practical consequence of believing God is present. The same pattern shapes David's charge to Solomon (1 Chronicles 28:20) and Paul's charge to the Corinthians: "Be watchful, stand firm in the faith, act like men, be strong" (1 Corinthians 16:13).
Paul's most quoted line on the subject belongs to this category. "I can do all things through him who strengthens me" (Philippians 4:13) is not a promise of unlimited achievement; the context is contentment in plenty and in hunger (Philippians 4:11-12). The strength Paul describes is the endurance to remain faithful in any circumstance.
Strength perfected in weakness
The most counterintuitive teaching on strength comes from 2 Corinthians. Paul pleads three times for his thorn in the flesh to be removed, and receives instead: "My grace is sufficient for you, for my power is made perfect in weakness" (2 Corinthians 12:9). Paul's conclusion — "for when I am weak, then I am strong" (2 Corinthians 12:10) — reframes weakness as the arena where divine power becomes visible. This is why Scripture warns against boasting in strength: "Let not the mighty man boast in his might... but let him who boasts boast in this, that he understands and knows me" (Jeremiah 9:23-24).
Where strength is renewed
Practically, the Bible points to several ordinary means. Waiting on the Lord in prayer (Isaiah 40:31). The joy of the Lord as a source of strength for a discouraged people (Nehemiah 8:10). God's word, which strengthens according to his promise (Psalm 119:28). The strengthening work of the Spirit "in your inner being" (Ephesians 3:16). And the company of others — "a threefold cord is not quickly broken" (Ecclesiastes 4:12). Strength in Scripture is rarely a solo achievement; it is sustained through prayer, Scripture, the Spirit, and the community of God's people.
Bible verses about strength
"He giveth power to the faint; and to him that hath no might he increaseth strength. Even the youths shall faint and be weary, and the young men shall utterly fall: but they that wait for Jehovah shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; they shall walk, and not faint."
"I can do all things in him that strengtheneth me."
"Jehovah is my strength and my shield; My heart hath trusted in him, and I am helped: Therefore my heart greatly rejoiceth; And with my song will I praise him."
"God is our refuge and strength, A very present help in trouble."
"Have not I commanded thee? Be strong and of good courage; be not affrighted, neither be thou dismayed: for Jehovah thy God is with thee whithersoever thou goest."
"And he hath said unto me, My grace is sufficient for thee: for my power is made perfect in weakness. Most gladly therefore will I rather glory in my weaknesses, that the power of Christ may rest upon me. Wherefore I take pleasure in weaknesses, in injuries, in necessities, in persecutions, in distresses, for Christ’s sake: for when I am weak, then am I strong."
"My flesh and my heart faileth; ButGod is the strength of my heart and my portion for ever."
"Then he said unto them, Go your way, eat the fat, and drink the sweet, and send portions unto him for whom nothing is prepared; for this day is holy unto our Lord: neither be ye grieved; for the joy of Jehovah is your strength."
"that he would grant you, according to the riches of his glory, that ye may be strengthened with power through his Spirit in the inward man;"
"Watch ye, stand fast in the faith, quit you like men, be strong."
"Jehovah is my strength and song, And he is become my salvation: This is my God, and I will praise him; My father’s God, and I will exalt him."
"My soul melteth for heaviness: Strengthen thou me according unto thy word."
Frequently asked
What is the best Bible verse about strength?
Isaiah 40:31 is the most widely cited: "They who wait for the LORD shall renew their strength; they shall mount up with wings like eagles; they shall run and not be weary; they shall walk and not faint." It is popular because it acknowledges exhaustion honestly before promising renewal, and it names the condition — waiting on the Lord — rather than simply urging people to try harder.
Does Philippians 4:13 mean I can accomplish anything?
Not in the sense of guaranteed success. In context, Paul has just described learning contentment "in whatever situation" — abundance and need, plenty and hunger (Philippians 4:11-12). "I can do all things through him who strengthens me" is a statement about endurance and faithfulness in every circumstance, not a promise that every goal will be achieved.
How does God give us strength when we feel weak?
Scripture describes ordinary means rather than a sudden surge of feeling: waiting on the Lord in prayer (Isaiah 40:31), the strengthening of the Spirit in the inner being (Ephesians 3:16), God's word (Psalm 119:28), the joy of the Lord (Nehemiah 8:10), and the support of other believers (Ecclesiastes 4:12). Paul also learned that God sometimes leaves the weakness in place so that his power is displayed through it (2 Corinthians 12:9).
What does "be strong and courageous" mean in Joshua 1:9?
It is a military-style charge given to Joshua as he takes over leadership of Israel before entering Canaan. The command is grounded in a promise: "for the LORD your God is with you wherever you go." Biblical courage is therefore a response to God's presence and promise rather than confidence in one's own capability.
Is it wrong to rely on my own strength?
The Bible affirms diligence and effort, but warns against boasting in strength or trusting it ultimately. Jeremiah 9:23-24 tells the mighty not to boast in their might but to boast in knowing the Lord, and Psalm 20:7 contrasts trusting in chariots and horses with trusting in the name of the Lord. The issue is not effort but where confidence finally rests.
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