How is Cai Xiang's calligraphy art embodied?

Cai Xiang is good at official script, regular script, running script and cursive script. Su Shi once commented on him: "Running script is the best, followed by small letters, cursive scripts and big characters." His regular script benefited from Yan Zhenqing, and his running script came from heather, and then he learned from other philosophers, catching up with the Jin people, learning from others, and forming his own style, which was peaceful, dignified and beautiful. There are few works handed down from generation to generation by Cai Xiang, because he cherishes his own works very much and doesn't write them to others easily. Others get his letters, which are all treasured.