成唯識論述記 1.597

1.597

述曰：又汝根本執無方分者，量云：所執極微應不共聚生麁果色；無方分故；如心、心所。心、心所法亦不共聚生麁果色，故以為喻。

The Commentary states: Furthermore, against your fundamental thesis of having no spatial divisions, the syllogism runs: 'The grasped atoms should not aggregate together to produce coarse resultant matter; because they have no spatial divisions; like citta and caitasika.' Citta and caitasika dharmas also do not aggregate together to produce coarse resultant matter, hence they are taken as the example.