Eunsahn Citta's Dharma talk on Wonhyo at One Mind Zen on June 2, 2021.
"In Korea, Wonhyo (617-666) was on his way to China, in the hopes of finding a master who would teach him Buddhism. While on his long walk, he became thirsty, but kept walking. By nightfall he was becoming dehydrated, and retreated into a cave. By luck, he found inside a bowl filled with water. He drank greedily and fell asleep. The next morning, in the light of day, he realized in quick succession that the cave was a tomb, the bowl was a skull, and the water inside it was fetid and filled with maggots. He threw up violently, at which point he was enlightened and saw no need to continue on to China".
--From "The Vomit of Insight" by Mike Jinji Wood.