The helmet first became a metaphor for salvation in Isaiah 59:17, where it referred to the salvation Christ would bring to humanity. In Ephesians 6:17, Paul picked up this metaphor when he said to Christians, “And take the helmet of salvation.” In Ephesians, Paul was writing to believers—people who’d already received salvation. So the purpose of the spiritual helmet was not to impart salvation but to protect the believer’s assurance of it. This assurance gives believers courage to fight their spiritual battles against mankind’s great deceiver. This idea is reinforced in 1 Thessalonians 5:8,
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