法界次第初門 1.253

1.253

二、捨支。離樂不悔，此心名捨。行者既得第四禪不動真定，則捨三禪難捨之樂，不生悔心，故名捨支。亦云：證四禪不動定時，不應取定起動念心。若心行捨，則無動念之乖也。

Second is the factor of equanimity. To abandon joy without regret—this mind is called 'equanimity'. Once the practitioner has attained the motionless true meditative absorption of the fourth dhyāna, they abandon the hard-to-relinquish joy of the third dhyāna and produce no regretful thought; hence it is called the factor of equanimity. It is also said: when realizing the motionless meditative absorption of the fourth dhyāna, one should not grasp at meditative absorption so as to stir thoughts. If the mind practices equanimity, there will be no deviation through stirred thoughts.