《太平广记·卷七·神仙七》
王远对蔡经说， 你命中该得道成仙，上天打算接你去补充仙宫的缺额，由于你从年轻时就没有学习道术的修炼，所以你现在精气少而身子肥胖，不可能成仙飞升。只有从肉体中解脱出来才能成仙，肉身的解脱不过像从狗洞中钻出去一样，你不要怕。 
遂语经曰： 汝生命应得度世，欲取汝以补官僚耳。然少不知道，今气少肉多，不得上去，当为尸解，如从狗窦中过耳。 
Wang Yuan said to Cai Jing, You are destined to become an immortal. The heaven intends to take you to fill the vacancies in the fairy palace. Because you have not studied the practice of Taoism since you were young, now you have less energy and a fat body. It's impossible to ascend to immortality. Only by getting rid of the body can one become immortal, and getting rid of the body is like crawling out of a dog hole, don't be afraid.