The phrase "Armor of God" (Ancient Greek: πανοπλίαν τοῦ Θεοῦ, panoplian tou Theou) is derived from Ephesians 6:11: "Put on the whole armour of God, that ye may be able to stand against the wiles of the devil." (King James Version). As a biblical reference, the metaphor may refer to physical armour worn by God in metaphorical battles, or it may refer to vigilant righteousness in general as bestowed by the grace of God (Romans 13:12, King James Version): "The night is far spent, the day is at hand: let us therefore cast off the works of darkness, and let us put on the armour of light."
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Armour of God in the context of Milites Christi
The miles Christianus 'Christian soldier' or miles Christi 'soldier of Christ' is a Christian allegory based on New Testament military metaphors, especially the Armor of God metaphor of military equipment standing for Christian virtues and on certain passages of the Old Testament from the Latin Vulgate. The plural of Latin miles 'soldier' is milites or the collective militia.
By the 5th century, the Church had started to develop doctrines that allowed for Christian participation in battle, though this was limited by a requirement that the fighting must be undertaken to convert infidels or spread the glory of Christ. Christians were not to fight for conquest or personal glory.