“Heap burning coals on his head”
For in so doing, you will heap burning coals on his head, and the LORD will reward you. (Proverbs 25:22 BSB)
What it sounds like today
A vindictive promise that kindness will secretly torment your enemy.
The cultural key
Read today, 'heap burning coals on his head' sounds like sanctified revenge, kill them with kindness so they suffer. But the context points the opposite way: it follows 'if your enemy is hungry, give him food' (25:21), and Paul quotes the whole passage to teach 'do not be overcome by evil, but overcome evil with good' (Romans 12:20-21). The coals are not torment but transformation. Two ancient backgrounds illuminate it: burning coals are a stock image for the hot sting of shame and remorse, so kindness makes an enemy burn with contrition; and some scholars point to an Egyptian penitential ritual in which a person showing a changed heart carried a basin of glowing coals on his head. Either way, the aim of the kindness is not to punish the enemy but to melt him to repentance and win him back.
Recovered meaning
The 'burning coals' are the heat of shame and repentance, not payback: unexpected kindness makes an enemy burn with remorse and can turn him into a friend. Paul cites it to say overcome evil with good, not to bless revenge.