俱舍論記 28.177

28.177

「論曰至無如此故」者，釋初句。初定根本及初定近分，尋、伺相應。上七定中，根本、近分皆無尋、伺。唯中間靜慮有伺無尋，故與近分差別不同，由無尋故勝初靜慮，由有伺故未及第二，依此義故立中間名。由此上地無中間靜慮，一地昇降無如此故。

"The treatise says […] there is none like this" explains the first line. The fundamental of the first dhyāna and the preliminary stage of the first dhyāna are associated with coarse examination (vitarka) and subtle investigation (vicāra). In the upper seven concentrations, the fundamentals and preliminary stages all lack coarse examination and subtle investigation. Only the intermediate dhyāna has subtle investigation without coarse examination; thus it differs from the preliminary stages. Because it lacks coarse examination, it is superior to the first dhyāna; because it has subtle investigation, it does not reach the second [dhyāna]. Relying on this meaning, the name 'intermediate' is established. Due to this, the higher stages lack intermediate dhyānas; within a single stage, ascending and descending has no case like this.