金剛經纂要刊定記 6.110

6.110

須菩提下。合云實有眾生，能信此法。彼能信者，非是凡夫眾生，非不是聖性眾生也。論云：「非眾生者，非凡夫體故。非不眾生者，以有聖體故，非不是聖體眾生。」偈云：「非眾生眾生，非聖非不聖，此中聖體者，佛之知見也。」以是信之根本故。

From "Subhūti" downwards: one ought to say that there truly are sentient beings who can have faith in this Dharma. Those who can believe are not ordinary sentient beings, nor are they not sentient beings of the noble nature. The treatise says: "'Non-sentient beings': because they do not have the substance of ordinary beings. 'Not non-sentient beings': because they possess the noble substance, they are not without the noble substance." The verse says: "Sentient beings who are not sentient beings, / Neither noble nor not noble; / Herein, the noble substance / Is the vision and knowledge of the Buddha." This is because it is the root of faith.