Ajahn Dhammasiha relates a beautiful story from Sakka Samyutta (Samyutta Nikāya, 11. Sakkasamyutta, #22 "Ugly" = Connected Discourses of the Buddha, page 338).
An ugly, disgusting little daemon once dared to sit down on the throne of Sakka, the king of the Tāvatimsa Devas. When the other devas notice that, they become upset, irritated and angry. But the more they complain and express their displeasure to the daemon, the stronger and more powerful the daemon becomes.
Fortunately, when Sakka himself arrives, he realizes that it is an anger-eating daemon. So he approaches the ugly daemon with exquisite friendliness, with utmost respectful and polite gestures. The result is that the daemon gets weaker and smaller with each kind word, and finally vanishes completely.
There's a profound metaphorical meaning in this story: The more we respond to anger with anger ourselves, the stronger the anger will become in all those involved. Anger feeds on itself, angy retaliation only leads to anger becoming stronger and stronger. The only way to conquer anger is through non-anger, through kindness, compassion and equanimity
More about Dhammagiri here