《大学章句集注·第八章》
心思不端正就像心不在自己身上一样：虽然在看，但却像没有看见一样；虽然在听，但却像没有听见一样；虽然在吃东西，但却一点也不知道是什么滋味。
心不在焉，视而不见，听而不闻，食而不知其味。
A mind that is not upright is like a mind that is not in oneself: Although looking, it is as if not seeing; Although listening, it is as if not hearing; Although eating, it is as if not knowing what it tastes like.