Coals of Fire on His Head

I guess I'm very bad and vengeful. You know that verse?
If your enemy is hungry, feed him,
and if he is thirsty, give him a drink.
For in doing so, you will heap coals of fire on his head.

(Romans 12:20)

It always struck me as if it were saying, "Be really nice to the dudes who hate you. That'll make 'em feel guilty. Oh yeah, if you're good to them when they're rotten to you, that'll show them! So ha!" What a guilt-free way to get 'em back ... by making them feel small for what they did to such a nice person as you.

Now, that wouldn't be exactly, uh, selfless and giving, now would it??

But you know what? When Isaiah saw heaven and was commissioned to be God's prophet (Isaiah 6) the angel took a coal from the altar and placed it on Isaiah's lips and said, This has has touched your lips; your iniquity is taken away, and your sin is purged.

So maybe the coals are not about "Ha! Got you! Don't you feel bad now?" but maybe it's just plain about the forgiveness of sins. If your enemy is hungry, feed him even though he expects retaliation. If your enemy is thirsty, give him a drink even though he wouldn't do that for you. For in doing so, you will show mercy and forgiveness, and if the absolution is heaped upon his head, it may purge his sin and work love & faith in his heart. "And you will gain your brother."