摩訶止觀 6.40

6.40

答：忍因智果，故十五心名「忍」，十六心名「智」。又二乘取證，宜判智斷；菩薩望佛，猶居因，但受忍名。又菩薩一品思盡，即一分自在生，故品品死、品品生；能忍生死勞苦，不入涅槃，故名「忍」。

Answer: Forbearance is the cause and cognition is the fruition; therefore the fifteen minds are called 'forbearances', and the sixteenth mind is called 'cognition'. Furthermore, the two vehicles realize fruition, so it is appropriate to designate them by 'cognition and severing'; the bodhisattva looks toward Buddhahood and still abides in the causal stage, so only the name 'forbearance' is received. Moreover, when the bodhisattva exhausts one grade of thought [delusion], he immediately attains one share of birth with sovereignty, and thus dies grade by grade and is born grade by grade; being able to endure the toil and suffering of birth and death without entering nirvāṇa, it is therefore called 'forbearance'.