Ephesians 6:17

Take the helmet of salvation. The Roman soldier wore on his head a metallic cap to protect it from blows, called a helmet. Isa 59:17 says: "He put a helmet of salvation on his head". See also 1Th 5:8. Salvation, the consciousness that we have a Savior "able to save unto the uttermost" (Heb 7:25).

And the sword of the Spirit. The armor before described is to protect; the sword to assail. It is the Christian soldier who is to wield the sword of the Spirit. That is, the Spirit conquers through him. The word is the word of God. Thus Peter conquered on Pentecost, and Paul in his labors. Thus always and everywhere. The Christian soldier filled with the Spirit must "preach the word". See Heb 4:12.
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