摩訶止觀 6.40

6.40

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'.