The most common saying is that this Cai was originally Cai Jing. Although people recognize his calligraphy attainments, they especially hate his character, so they are unwilling to recognize his status as a calligrapher. In Yuan You, Song Zhezong, in order to crowd out dissidents, he called Sima Guang and others "traitors", and wrote down their "crimes" in his own handwriting, engraved on monuments all over the country. At that time, many masons refused to carve this monument and were executed by Kantou. When Cai Jing died, people immediately smashed the "Yuan You Monument to the Party History". People also called him "the four treacherous court officials" together with Gao Qiu, Tong Guan and Emperor Wen of Sui, who were in charge of state affairs at that time.
Cai Jing's character is extremely bad. Among the "four great calligraphers", how can people tolerate him? So I fired him. But "Su Huang Camouflage" is easy to say, so let Cai Xiang take its place.
Cai Xiang is good at absorbing the essence of his ancestors, and he works very hard. His calligraphy is very distinctive. So people think that he should be at the top of the "four schools" and should not be dragged down by Cai Jing.
Cai Xiang not only has a high attainments in calligraphy, but also has an excellent personality. When he was an official in the DPRK, he dared to speak frankly, and even some powerful ministers were afraid of his three points. When he was an official in Quanzhou, Fujian, he built the famous Luoyang Bridge and Qili Avenue, which were welcomed by the local people.
From this perspective, character is more important than books. If a person can only write good words, but can't do good deeds, the people will inevitably abandon him, even if they don't leave him a small place in the world of books.