Concerning the word yuishin 唯心, which appears in Dōgenʼs Shōbōgenzō, in the fascicles “Sokushin zebutsu” 即心是仏 and “Beppon shin fukatoku” 別本心不可得, Dōgen does not consider mind only to be the basis of the ultimate truth of phenomena. However, later, in the “Gyōbutsu iigi” 行仏威儀 fascicle, Dōgen considers that mind only indicates that the ultimate truth is the phenomenon of walls and rubble. In the “Shinjin gakudō” 身心学道 fascicle, Dōgen rejects the idea that ʻDharma-Sphere is nothing but mind’ 法界唯心 along with ʻthe triple world is nothing but mind’ 三界唯心. In the “Sangai yuishin” 三界唯心 fascicle, the word yuishin is not used by itself, but all affirmations of the triple world are emphasized. In the “Hotsumujōshin” 発無上心 fascicle, Dōgen teaches that ʻgrasses, trees, and rubble,’ ʻthe four elements and the five skandhas,’ and ʻthe whole realm throughout the ten directions’ are the ultimate truth, and he considers ʻyuishin,’ ʻthe true aspect,’ ʻSuchness [or] Buddha-nature,’ and ʻcertainty of dharma’ as their basis. Here, we can consider that Dōgenʼs fundamental claim is that dharmas are ʻthe true aspect.’
