《左传·哀公·哀公十八年》
《夏书》说： 占卜的官员只有能够审察判断人的意愿，然后才使用龟甲。 
《夏书》曰： 官占，唯能蔽志，昆命于元龟。 
The 'Book of Xia' said, "The officer in charge of divination must have the ability to discern people's wishes before he uses the tortoise shells."