What Does It Mean to Heap Burning Coils on Someone's Head?

Many people have been confused by this whole idea of burning coals on top of people's head reference. Brent: The answer is where, Brent? In the text. We become his instruments of love and hospitality to bless others. Whether these others are fellow believers in the body of Christ, or are very enemies, matters not. Love must be sincere. Hate what is evil, cling to what is good. Be devoted to one another in love. Do not take revenge, my dear friends, but leave room for God's wrath.