《太平广记·卷二十二·神仙二十二》
罗公远说： 经书里有这内心的杂念，穿草衣吃树叶，不是至高地位的人所能做到的。 
刳心灭智，草衣木食，非至尊所能。 
Luo Gongyuan said: "According to the scriptures, the mind is full of distracting thoughts, and wearing grass clothes and eating tree leaves is not something that people of the highest status can do. 