成唯識論演祕 2.47

2.47

聚不異言，牒有宗救，聚色與微而無異故。無二之言，天親難彼，聚色應無影、障二也，即極微故，猶如極微。

The words 'the aggregate is not different' restate the defense of the Sarvāstivāda school, namely that aggregated matter is not different from atoms. The words 'lacking both' are Vasubandhu's objection to them: aggregated matter should lack both shadow and obstruction, precisely because it is the atoms, just like an atom.