Ābhūta-saṃplava & Loka-vibhāga
Dissolution Threshold and the Fourteen Abodes
परमाणुः सुसूक्ष्मस्तु भावग्राह्यो न चक्षुषा / यदभेद्यतमं लोके विज्ञेयं परमाणुवत्
paramāṇuḥ susūkṣmastu bhāvagrāhyo na cakṣuṣā / yadabhedyatamaṃ loke vijñeyaṃ paramāṇuvat
The paramāṇu is exceedingly subtle—grasped by inner understanding, not by the eyes. Whatever is most indivisible in the world should be known as being like the paramāṇu.