折疑論 4.6

4.6

若蚯蚓置之於五味。犬豕飲之以醪醴。彼必反以為毒者何也。蓋非適其所養。若蚯蚓投之以污池。犬豕飼之以糟漿。彼必宛轉詰屈。掉尾奮蹄。從而悅之者何也。蓋適其所養之道也（宛轉詰屈。乃蚯蚓動轉貌。掉尾奮蹄。乃犬豕悅豫貌）。

'If an earthworm were placed in the five flavors, or a dog or pig were given rich wine and sweet liquor to drink, they would surely consider it poison. Why is this? Because it does not suit what nourishes them. If an earthworm is cast into a muddy pool, or a dog or pig is fed dregs and swill, it will surely wriggle and bend, wag its tail and kick its hooves, following along with delight. Why is this? Because it suits the way of what nourishes them. (Wriggling and bending is the appearance of an earthworm moving; wagging its tail and kicking its hooves is the appearance of a dog or pig being joyful.)