Tang-dynasty recluse Chan master of Longshan in Tanzhou, counted among Mazu Daoyi's dharma heirs. He is famous for the encounter in which Dongshan Liangjie and Shenshan, following stray cabbage leaves down a mountain stream, found him living hidden; asked how long he had been there he said 'spring and autumn do not reach me', and what he had realised: 'I saw two clay oxen fight their way into the sea, and to this day there has been no news of them.' He answered Dongshan on guest and host ('green mountains covered by white clouds'), then burned his hut and vanished deeper into the mountains — whence later generations called him the Hidden Mountain monk.
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