《韩非子·外储说右上》
但驱赶它，它不上前；制止它，它不停步；叫它左，它不左；叫它右，它不右；那么奴仆虽然低贱，也不依托它的脚力。
然而驱之不前，却之不止，左之不左，右之不右，则臧获虽贱，不托其足。
But when it is driven, it does not come forward; when it is stopped, it does not stop; it is called left, it does not go left; it is called right, it does not go right; then even though the servant is lowly, he does not rely on its strength.