《左传·昭公·昭公十二年》
而且能不能在下位而恭敬呢？中美就是黄，上美就是元，下美就是裳，这三者都具备了才可以合于卦辞的预测。
中美能黄，上美为元，下美则裳，参成可筮。
Moreover, how can there be reverence in the lowest position? That which is yellow is the center; that which is variegated is the top; that which is azure is the bottom. These being all complete, the indications of the hexagram may be fulfilled. 