There is a Chan debate between the two masters, Huai Jang, a disciple of the Tang Dynasty Sixth Patriarch, and the monk Tao Yi, who spent every day braving wind and rain to sit in meditation on a mountain. One day Huai Jang asked Tao Yi, "Great virtuous one!
禪門有公案，唐時六祖慧能的弟子懷讓在南岳衡山傳道，一名叫道一的僧人風雨寒暑不避，日日上山坐禪，懷讓問他「大德！