In ancient times soldiers who went into battle were clad in heavy armor to protect them against the spears and arrows of their enemies. In Ephesians, chapter 6, the Apostle Paul urges his fellow-Christians to take upon themselves the "whole armor of God." Be equipped, he says, with the "breastplate of righteousness," "the shield of faith," "the helmet of salvation," "the sword of the Spirit."

"Stand," he says, stand up against evil. "Withstand in the evil day," he says, and "quench the flaming da…