Lets look at this example, ''a group of people who came together at the village square with their fire wood, and they lights it up to burn and after the story telling, they go home with the light on their fire wood and it helps them see and keeps them warm''. This is the same thing with prayers in church, when we pray together,we generate light and fire to face any challenges of life. Prayer keeps us hot and drives away darkness, it enables us tackle spiritual battle.
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From @princessfrank