But we belong to the day. The fact that he stresses this, may imply that some were not living this way. He uses the symbolism of a soldier's armor to emphasize what he is saying. Faith and love. As a breastplate to protect our "heart." Hope of salvation. As a helmet to protect our "head." The Christian's fight is against wicked spiritual forces (Ephesians 6:12). (Compare Ephesians 6:13-18.)

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Old Testament