Ephesians 6:10 Commentary: Be Strengthened in the Lord

Paul writes from imprisonment (probably Rome) to a church he founded in Ephesus, a major port city in Asia Minor and the site of the temple of Artemis, one of the Seven Wonders of the ancient world. Ephesus was saturated with pagan religion, magical practices, and the imperial cult. Paul’s three-year ministry there (Acts 20:31) had been marked by power encounters, exorcisms, public burning of magic scrolls, and a riot incited by silversmiths who profited from Artemis worship (Acts 19:23, 41). The young believers faced not only social pressure but genuine spiritual opposition from what Paul calls “principalities and powers” (Eph 6:12).

The letter itself moves from doctrinal exposition (chapters 1, 3) to ethical exhortation (chapters 4, 6). In chapter 6, after giving instructions for wives, husbands, children, parents, slaves, and masters, Paul turns to the cosmic battle that underlies all those relationships. The adverb “finally” (τοῦ λοιποῦ) signals both a conclusion and a fresh urgency: “for the rest” or “from now on”, the time for passive learning is over; the battle is joined. The metaphor of the soldier’s armor that follows (vv. 11, 17) draws on Old Testament images of God as warrior (Exod 15:3, Isa 59:17) and the righteous person’s equipment. This verse sets the condition for the entire warfare passage: without strength from the Lord, the best armor is useless.

The only significant textual variant noted in the consulted commentaries is the inclusion or omission of “my brethren” (μου ἀδελφοί). The Cambridge Bible for Schools and Colleges and Jamieson-Fausset-Brown observe that some of the oldest manuscripts (e.g., Sinaiticus, Vaticanus) omit the phrase, while the Vulgate and some other witnesses retain it. Vincent’s Word Studies also omits it. The address “brethren” occurs nowhere else in this epistle. Both readings are well-supported, and the meaning is not substantially affected. No other variants are mentioned in the supplied sources.

Ephesians 6:10 has been a foundational text in Christian teaching on spiritual strength and conflict. Its position at the head of the armor of God passage made it a fixture in catechetical instruction on the Christian warfare, especially in the early and medieval church. The Vulgate’s rendering confortamini influenced the understanding of strength as a gift to be received. Reformed exegetes such as Calvin used the verse to underscore the priority of divine grace: the command itself implies both human responsibility and God’s supplying hand. In Protestant hymnody, the phrase “be strong in the Lord” appears in hymns of spiritual battle, often linked with the full armor. Across traditions, this verse has been quoted in times of persecution and personal trial, reminding believers that their true resource is not their own resolve but the Lord’s inexhaustible power.

Three-point outline

1. The command to be strengthened. Paul uses a passive imperative, literally “be empowered.” This is not a call to work up your own courage. It is an instruction to receive strength from outside yourself, from the Lord. The present tense implies ongoing, habitual receptiveness.
2. The source: union with Christ. “In the Lord” is the phrase that runs through the whole letter (about 35 times, says the Cambridge Bible). All strength flows from being connected to Christ, like a branch to a vine (John 15:4, 5). Apart from him, we are weak; in him, we can do all things (Phil 4:13).
3. The resource: His mighty power. The double phrase “the power of his might” (κράτος and ἰσχύς) emphasizes that God’s strength is both vast in capacity and active in delivery. It meets the intensity of the enemies listed in verses 12, 13.

Five-point outline

1. Finally, the transition from peaceable duties to open conflict.
2. Be strong, a command for the will, not just a suggestion.
3. In the Lord, the only safe place to take your stand.
4. In the power of his might, the sheer scale of divine resource available.
5. For the battle, the enemies are spiritual, not human (v. 12).

Illustration hooks

• A weightlifter who tries to bench-press beyond his limit quickly learns he needs a spotter, someone else’s strength to finish the lift. The Christian life requires a spotter who is the Lord himself.
• A soldier knows that personal bravery is useless without supply lines, reinforcements, and a commander’s strategy. Paul insists that all of that comes from above.
• A new parent, exhausted and out of resources, discovers that the strength to get through each day comes from somewhere beyond their own reserves.

Questions your congregation is asking

• “How do I become strong in the Lord in a practical, daily way?”
• “If it’s God’s strength, does that mean I don’t need to try? What is my part?”
• “What if I feel weak and defeated much of the time, does this verse still apply?”

Ephesians 6:10 is the hinge verse in Paul’s letter. He has spent five chapters explaining the gospel and applying it to everyday relationships. Now he shifts focus to the spiritual conflict that threatens those relationships. This small group guide helps you consider how God’s strength actually operates in a believer’s life.

Discussion questions

1. What is the grammatical mood and voice of the verb “be strong” in the original? Why does it matter that it is passive?
2. Paul says “in the Lord” about 35 times in this letter. What does this phrase imply about the location of our strength?
3. Why does Paul pile up two nearly synonymous words for power (κράτος and ἰσχύς)? What does this suggest about the kind of strength we need?
4. How does this verse serve as a transition from the household instructions (Eph 5:21, 6:9) to the armor of God (6:11, 20)?
5. Calvin said the command is a call to ask God to supply what we lack, while Wesley focused on the duty to “be strong” as an active choice. How do you see both sides working together?
6. Think of a situation where you felt you had no strength left. How might this verse have changed the way you approached that moment?
7. Based on this verse, what is the first step we should take when we sense spiritual opposition?