成唯識論述記 2.25

2.25

The Commentary states: This is the direct challenge: catching light and casting shadows differ between east and west, hence we know atoms definitely have spatial parts. If, when the sun illuminates a pillar, the atoms in it lacked spatial parts, then when the sun illuminated the eastern side, the western side would also have light; because lacking spatial parts, there should be no obstruction. 'Your atoms should have spatial parts; because they are composite matter; like composite matter.' The eastern side is not the west, clearly proving they have spatial parts.