俱舍論頌疏論本 1.99

1.99

隨流者，明無表相。隨謂隨順，性相似故。流謂流轉，相續起故。故論云：「相似相續，說名隨流（相似名隨，相續名流）。」淨不淨者，出無表體。無表唯善惡，不通無記性，名淨不淨。

'Flowing continuously' clarifies the characteristic of the unmanifest. 'Conforming' (sui) means conforming, because its nature is similar. 'Flowing' (liu) means coursing on, because it arises in continuity. Therefore the treatise says: 'A similar continuity is called flowing continuously (similarity is called conforming; continuity is called flowing).' 'Pure or impure' brings out the essence of the unmanifest. The unmanifest is exclusively wholesome or unwholesome and does not extend to the indeterminate nature; this is called pure or impure.