What the Bible Says About Strength: Key Passages Explained

The Hebrew and Greek words behind "strength" in Scripture carry a range of meaning — power, might, force, courage, ability — but they share a common thread: genuine strength is rooted in who God is, not in human capacity. The passages below trace that theme from Isaiah to Paul, and each one challenges the assumption that strength is something you generate on your own.

Isaiah 40:31 — Strength renewed by waiting

The Hebrew verb translated "hope" or "wait" here is qavah — to wait expectantly, to bind together, like strands twisting into a cord. It is not passive resignation but active, directed trust. The promise is to those who do this: their strength will be renewed, literally "exchanged" — the old depleted strength replaced with something new.

The imagery builds in reverse order: flying, then running, then walking. Walking without fainting is harder in some ways than short bursts of high intensity. The passage addresses long-haul exhaustion — the kind that accumulates over years of difficulty. Isaiah 40 opens with "comfort my people" and ends here, because the deepest comfort is not the removal of hard circumstances but the renewal of the strength to endure them.

Read the full chapter: Isaiah 40.

Philippians 4:13 — Strength through Christ

This verse is one of the most quoted in the Bible — and one of the most misread. The "all this" does not refer to any goal or achievement. The context is contentment in every circumstance: Paul has learned to be content whether well-fed or hungry, whether living in plenty or in want (v. 12). The strength Christ provides is the strength to be content in suffering, not a guarantee of success in any endeavor.

The Greek verb endunamoō — "gives me strength" — is used elsewhere in Paul's letters for the strengthening that comes through union with Christ (Ephesians 6:10, 2 Timothy 4:17). It is not motivational power in a general sense. It is the ongoing enabling that comes from being in Christ — strength poured into a person from outside, not generated from within.

Read: Philippians 4.

2 Corinthians 12:10 — Strength made perfect in weakness

This is perhaps the most counterintuitive statement in the New Testament. Paul reaches it after describing a "thorn in the flesh" he begged God three times to remove. God's answer was not removal but a promise: "My grace is sufficient for you, for my power is made perfect in weakness" (v. 9).

The Greek word for "made perfect" is teleoō — to complete, to bring to its goal or end. God's power reaches its full display not in demonstrations of human strength but in the contrast with human weakness. Paul's conclusion is not resignation — he says he "delights" in weakness. The reason is specific: when his own capacity runs out, Christ's power is unobstructed. Weakness is not an obstacle to strength; it's the condition in which God's strength is most clearly seen.

Read: 2 Corinthians 12.

Psalm 46:1 — God as strength in trouble

The Hebrew word translated "strength" here is ʿoz — a word for power, might, and fortified security. God is not just a source of strength; he is described as strength itself — and as an "ever-present help," literally "found abundantly" or "well-proven" in trouble. This is not a theoretical claim. The psalm continues with images of total catastrophe: mountains falling into the sea, nations in uproar, kingdoms collapsing. God's presence remains unmoved through all of it.

The refrain of the psalm — "The Lord Almighty is with us; the God of Jacob is our fortress" (vv. 7, 11) — ties strength directly to presence. It is not an ability God imparts from a distance. His being with his people is the strength. Psalm 46 is the historical background to Martin Luther's "A Mighty Fortress Is Our God," written during a period of intense personal and political crisis, drawing on exactly this claim.

Read: Psalm 46.

Ephesians 6:10 — Strength for spiritual warfare

The command is striking: "be strong in the Lord" — not be strong, full stop. The preposition matters. Paul's imperative is not self-improvement or willpower. It is strength located in another. The Greek word endunamoō appears again here — the same term as in Philippians 4:13 — meaning to be empowered, to receive strength from outside oneself.

Ephesians 6:10 opens the famous "armor of God" passage (vv. 10–18), which describes a struggle "not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world." The armor that follows — truth, righteousness, the gospel of peace, faith, salvation, the word of God — is not self-generated virtue. Each piece describes something already given, something received and worn rather than manufactured. The strength Paul calls Christians to is the strength of someone who has been equipped, not someone who has built up their own resources.

Read: Ephesians 6.

What these passages have in common

• ✦Strength comes from God, not from the self. Whether Isaiah's renewal, Paul's enabling in Christ, or the armor of Ephesians 6, biblical strength is always received — not generated.
• ✦Weakness is not the enemy of strength. 2 Corinthians 12 makes explicit what the other passages imply: human weakness is the condition in which God's power is most fully displayed.
• ✦Strength is relational, not mechanical. It flows from God's presence (Psalm 46), union with Christ (Philippians 4:13), and waiting on the Lord (Isaiah 40:31) — not from techniques or discipline alone.
• ✦It is for endurance, not just exertion. The Bible's vision of strength is less about peak performance and more about walking without fainting — sustained faithfulness through years of difficulty.