《太平广记·卷二·神仙二》
古代的圣人，担心愚钝的人们，不掌握事情的分寸，沉浸在欲河中流连忘返，因而要断绝人欲之源。所以有些非常高洁的雅士们不与妻子同床，其次的一些士人们则不和妻子同被。就是吃上一百副药，也不如一个人独自静卧修养。
古之至人，恐下才之子，不识事宜，流遁不还，故绝其源：故有上士别床，中士异被，服药百裹，不如独卧。
The ancient sages worried that unintelligent people would not master the correct proportions of things and would indulge in worldly pleasures, so they sought to cut off the source of human desires. Some extremely refined gentlemen, for example, would not share a bed with their wives. Others would not share a cover. Even taking a hundred doses of medicine would not be as beneficial as a person lying quietly and still alone.