俱舍論疏 15.154

15.154

論「是善而劣」，答也。問上地捨受勝善能感，何故三定已下捨受劣善所感耶？答：勝、劣有二：一異地辨勝、劣；二當地異受辨勝、劣。若同地有三受，樂勝、捨受劣。下樂上地捨，捨勝、樂是劣。如欲界分三受，樂勝、捨是劣。欲樂對初捨，捨勝、欲樂劣。《婆沙》一百一十五云「問：何故捨根唯善業感，非不善耶？答：捨根行相漸細寂靜，智者所樂，故善業感。諸不善業性是麁動故，不能感捨受異熟。」

On the Śāstra's statement: "It is wholesome, but inferior": This is the answer. Question: Neutral sensation of the higher stages is experienced by superior wholesome [action]; why is neutral sensation below the third dhyāna experienced by inferior wholesome [action]? Answer: There are two kinds of superior and inferior: first, determining superior and inferior across different stages; second, determining superior and inferior across different sensations in the same stage. If there are three sensations in the same stage, pleasure is superior and neutral sensation is inferior. Comparing lower pleasure with higher neutral sensation, neutral sensation is superior and pleasure is inferior. For example, dividing the three sensations in the desire realm, pleasure is superior and neutral is inferior. Comparing desire-realm pleasure with the intermediate [or first dhyāna's] neutral sensation, neutral sensation is superior and desire-realm pleasure is inferior. The Vibhāṣā, fascicle 115, says: "Question: Why is the faculty of equanimity experienced only by wholesome action and not by unwholesome? Answer: The mode of activity of the faculty of equanimity is progressively subtle and tranquil, desired by the wise; hence it is experienced by wholesome action. Because all unwholesome actions are by nature coarse and agitated, they cannot experience the ripening of neutral sensation."