The punishment for Prometheus stealing fire from the Gods and gifting it to humanity, was to be chained to a rock and having an eagle feed on his liver which would regrow the next day.
For what it's worth, Prometheus was a Titan, and Titan was immortal, so his liver regrowing the next day wasn't really that special. If eagle fed on his heart, or lungs, they would've regrown too.
The Greeks chose liver because it symbolized the defiance Prometheus had against gods.
There are a bunch of Japanese words (including a several loanwords from Chinese) that use the liver / gallbladder metaphorically for courage. Both derive from associations between the humours and personality / behavior. I have no idea, however, why both Eastern and Western naive psychology associate gall with, well, gall.
vconnor · · focus · HN ↗
bheadmaster · · focus · HN ↗
The Greeks chose liver because it symbolized the defiance Prometheus had against gods.
seizethecheese · · focus · HN ↗
jephs · · focus · HN ↗
BobaFloutist · · focus · HN ↗
Possibly because it's filled with strong acid.