Ephesians 6:10

Be strong is not, in the Greek, an instruction to generate strength. The verb is passive — be made strong, be strengthened. You are not the source in this sentence. You are the thing being acted upon.

That matters, because the natural reading in English is a coach's line: dig deep, find it in yourself. Paul is saying almost the opposite. The command is to be strengthened, and the two phrases that follow tell you where the strengthening comes from: in the Lord, and in the strength of his might.

The doubling there is not padding. Two different words for power sit side by side — one closer to inherent capacity, the other to demonstrated force. Roughly: what he is able to do, and what he actually does. Paul stacks them because he is about to describe a conflict in which the reader's own resources are simply not the relevant quantity.

And note where this sits. Finally — the word marks the close of the letter. Everything before it has been about identity, marriage, work, speech, forgiveness. Only now does he raise the subject of a fight, and when he does, every piece of equipment he lists belongs to someone else. The belt, the breastplate, the shoes, the shield are all described elsewhere in Scripture as God's own. The soldier is not issued his own kit. He is issued God's.