《庄子·杂篇·徐无鬼》
所以，水保持住了泥土也就安定下来，影子留住了是因为人体安定下来，事物固守着事物因而相互安定下来。
故水之守土也审，影之守人也审，物之守物也审。
Therefore, the water maintains its state and becomes stable; the shadow remains because the object is stable; and they depend on each other to achieve stability.