首楞嚴義疏注經 9.66

9.66

When the minds of suffering and bliss are extinguished, opposition perishes; since mutual relativity is gone, it is said that 'they do not clash,' and not clashing means there is no affliction. When the two mutually relative minds of suffering and bliss are first extinguished, in the initial grade of mixed cultivation one slightly departs from the obstacles to concentration, which is called 'no affliction'—affliction being obstacle. However, the heavens below are also free from suffering and bliss yet are not called 'No Affliction' because ordinary beings only temporarily suppress them through revulsion and attraction, rather than severing them forever. Here, it is named in terms of their ultimately not arising.