A Needle for Zazen
Shin means a bamboo needle that was used for acupuncture in ancient China. So shin means a method of healing body and mind, and the word came to be used for a maxim that has the power to cure a human being of physical and mental discomfort. Subsequently, the word shin was used to describe short verses useful in teaching the important points of a method of training. In this chapter Master Dogen first explained the true meaning of Zazen, quoting and commenting on a famous exchange between Master Nangaku and Master Baso. Then he praised a Zazenshin by Master Wanshi Shokaku, and finally, he wrote his own Zazenshin.