王国维在《与友人论〈诗〉、〈书〉中成语书》里说:《诗》、《书》为人人诵习之书,然于六艺中最难读。以弟之愚暗,于《书》所不能解者殆十之五,于《诗》亦十之一二。此非独弟所不能解也,汉魏以来诸大师未尝不强为之说,然其说终不可通,以是知先儒亦不能解也。 Wang Guowei said in his book “The Book of Idioms” with his friends that “Poetry” and “Book” are the books for everyone, but the most difficult to read in Liu Yi. In the darkness of brotherhood, in the “book” can not be solved by ten ten, in the “poem” is also one of two. This non-solo brother can not be solved, since the Han and Wei master not bad is not said that, of course, the end is impossible, so knowledge of the first Confucianism can not solve too.