《太平广记·卷十二·神仙十二》
人们都不认识壶公，他卖药不许还价，他的药服后不管什么病都能治好。
人莫识之，卖药口不二价，治病皆愈。
No one recognized the Hermit with the Gourd, he did not allow bargaining for his medicine, and his medicine could cure any disease after taking it.