俱舍論頌疏論本 28.91

28.91

釋曰：中間靜慮無尋唯伺，具三等至，唯捨相應。言中間者，謂初靜慮尋、伺相應，二禪已上皆無尋無伺，唯中間靜慮有伺無尋，故彼勝初。未及第二依此義故，立中間名，此定能招大梵處果，多修習者為大梵故。

Explanation: The intermediate dhyāna is without gross investigation and with subtle reflection only, possesses all three absorptions, and is associated only with equanimity. As for 'intermediate', the first dhyāna is associated with both gross investigation and subtle reflection, while from the second dhyāna upward all are without gross investigation and without subtle reflection; only the intermediate dhyāna has subtle reflection without gross investigation, and hence it is superior to the first. Because it has not yet reached the second, on the basis of this meaning the name 'intermediate' is established. This concentration can invite the fruit of the Mahābrahmā realm, because those who cultivate it frequently become Mahābrahmā.