《陈书·列传·卷十八》
至于爻画的深意寓含在《六经》裹面，诠释的要义尽在《两系》之中，对此，名儒大家长年累月地高谈阔论，鸿生巨子经岁成年地抵掌而辩，但都没有谁能进入《易》的边缘，连皮毛也不曾达到。
至若爻画之苞于《六经》，文辞之穷于《两系》，名儒剧谈以历载，鸿生抵掌以终年，莫有试游其籓，未尝一见其涘。
As for the profound meaning of the hexagrams contained in the "Six Classics", the essence of the interpretation lies in the "Two Systems". For this, famous Confucian scholars have talked for years, and great scholars have argued for years, but none of them have been able to enter the realm of the "Book of Changes", not even its superficial aspects.