成唯識論述記 2.31

2.31

述曰：此第四、極微無中、表微聚不異難。若無所擬東、西等方，所有極微應相涉入，合為一體，便不成麁。《二十頌》云：「極微與六合，一應成六分，若與六同處，聚應如極微。」初半是前，後半是此。由此極微定有方分，故《俱舍》云：「觸與不觸皆應有分。」

The Commentary states: This is the fourth objection: that if atoms lack a middle and exterior, the atomic aggregate would not be different [in size from a single atom]. If they lack the juxtaposed directions of east, west, and so forth, all atoms should interpenetrate and coalesce into a single substance, and thus coarse [matter] would not be formed. The Viṃśatikā says: 'When an atom joins with six, one must have six parts; if it is in the same place as the six, the aggregate must be like an atom.' The first half refers to the preceding [argument], and the second half refers to this one. Because of this, atoms definitely have spatial parts; hence the Abhidharmakośa says: 'Whether touching or not touching, all must have parts.'