《淮南子·本经训》
所以闭目塞耳、缄口静心，防止精神因物欲而散逸，这样就和 道 融合了。因此，将神明保存于一种静穆虚无的状态中，精气就会返回到至真纯朴的本性内，就可以做到眼睛尽管明亮却什么也不去看，耳朵尽管聪敏却什么也不去听，心体透亮而什么也不去想；委顺事物而不作为，保持平和而不骄矜，冥性命之精，不思虑、不喜怒，不运用聪明，保持心体平静，这样智巧就难以混杂在其中了。
故闭四关，止五遁，则与道沦，是故神明藏于无形，精神反于至真，则目明而不以视，耳聪而不以听，心条达而不以思虑；委而弗为，和而弗矜；冥性命之情，而智故不得杂焉。
Therefore, close your eyes and ears, shut your mouth and stay calm, and prevent your spirit from being distracted by material desires, in this way you will integrate with the Tao. Therefore, keeping the spirit in a calm and empty state, vitality will return to its truest and purest nature, and it will be possible to see nothing even though the eyes are bright, hear nothing even though the ears are keen, and think nothing even though the mind is clear; follow things but do nothing, stay calm but not arrogant, avoid the essence of life and death, do not think, do not be happy or angry, do not use intelligence, keep your mind calm, so that wisdom will find it difficult to mix in.