《庄子·杂篇·则阳》
大公调说： 鸡鸣狗叫，这是人人都能了解的现象；可是，即使是具有超人的才智，也不能用言语来称述其自我变化的原因，同样也不能臆断它们将会怎么样。
大公调曰： 鸡鸣狗吠，是人之所知。虽有大知，不能以言读其所自化，又不能以意其所将为。
The impartial lord said: The crowing of a chicken and the barking of a dog is a phenomenon which everyone can understand, but even if one is endowed with extraordinary intelligence, the use of language cannot describe the reason for their internal changes and neither can one arbitrarily determine what they will turn into.