George Leo Haydock

Thou shalt heap coals of fire on his head. This figurative way of speaking is differently expounded. Some say, inasmuch as by this means thou shalt make him liable to greater punishments from God. Others, as St. Jerome and St. Augustine, by coals of fire, understand kindnesses and benefits, which shall touch the heart, and inflame the affections even of thy enemies, which shall make them sorry for what they have done, and become thy friends. (Witham)