In all fairness, the proposal of "Cai Jing Theory" does have some truth. Cai Jing's calligraphy art has the characteristics of verve, boldness and calmness. Compared with Cai Xiang, which has preserved more "ancient laws", Cai Jing's calligraphy seems to be more innovative and can better reflect the aesthetic taste of calligraphy in the Song Dynasty. Therefore, it enjoyed a high reputation at that time, and many people studied its books in the government and the public. Yuan Tao chiayi's "Book History Society" once quoted critics at that time as saying; "Its strict and informal, is nothing more than rules. Books are like swords, and they are discussed in the temple; Running script is like a son in your belly, passionate and radiant; The big characters are the best in the world, and there are few horses. " It can reflect Cai Jing's position in calligraphy art at that time. Secondly, Cai Xiang's calligraphy was praised as "the first in the North Song Dynasty" in the early years, but since the formation of the new book style in the Middle Northern Song Dynasty, people have gradually criticized Cai Xiang's calligraphy. Su Dongpo mentioned many times in Dongpo's inscription that "those who wrote Mo Jun in recent years have quite different opinions", and that "Mo Jun is the best in the world, and the critics are not". Although Su Shi always insisted that Cai Xiang should be the first, at least in the middle and late Northern Song Dynasty, people's evaluation of Cai Xiang was not so consistent. Thirdly, from the arrangement order, the arrangement of Su, Huang and Mi has obvious generational order. Cai Xiang is a Renzong, ranking first among Zhezong and Huizong, second only to Mi Fei. There are some doubts.
In this regard, people who insist on "Cai Xiang's theory" retort that although there is no "Song Sijia" theory in Song literature so far, Cun Wang, a adherent of the Southern Song Dynasty and Yuan Dynasty, has clearly put forward the "four schools" theory. In the ink of Postscript Cai Xiang Tao and Shi Yanming, he said that Cai Xiang's calligraphy was "sparse and self-contained, and there were four calligraphy schools at that time. A sneak peek, Dongpo muddy cycle looks the strongest, Fucheng Weng is thin and hard, Xiangyang changes vertically and horizontally, but it is better to put pen to paper. If you are indifferent, look at those people with rope rulers, and you will be selfless. Thus, it is pointed out that there were not only four schools at that time, but also these four schools were obviously Su, Huang, Mi and Cai. In addition, in the history of calligraphy, Cai Xiang's achievements in calligraphy are obvious to all, and his calligraphy style is unique, and he has also contributed to rejecting calligraphy and revitalizing the style of calligraphy. So overall, his achievements are obviously more than Cai Jing's. Regarding the arrangement order, Zhang Boju once pointed out in the article "The Book of Song Sijia" that "the order should be Cai, Su, Mi and Huang, and the general pronunciation should be Su, Huang, Mi and Cai, which means that it is a habit to equate Yin and Yang. "It shows that this arrangement is only formed by the fluency of pronunciation, and has nothing to do with the seniority of the four masters.
It seems that "Cai Jing Theory" is not nonsense, and "Cai Xiang Theory" is well-founded. Because Cai Jing is one of the "Six Thieves", it is really difficult for people to accept him emotionally, so people tend to Cai Xiang. But it seems that the final conclusion of this problem should be confirmed by the literature of Song Dynasty.