《淮南子·主术训》
所以，最纯精的东西，你不用召唤它就会自然到来、不用挥手它就会自然离去；它幽深玄妙，神不知鬼不觉地就使事物自然成功；有智慧者无法说清楚，善辩者又无法形容它。
故至精之像，弗招而自来，不麾而自往，窈窈冥冥，不知为之者谁，而功自成。智者弗能诵，辩者弗能形。
Therefore, the purest and most refined things, you do not need to summon it will come naturally, you do not need to wave it will naturally leave; it is profound and mysterious, and it makes things succeed naturally without anyone knowing it; the wise cannot explain it clearly, and the eloquent cannot describe it.