ŚiraUpan, 1, 35.7 atha kasmād ucyate sūkṣmaṃ yasmād uccāryamāṇa eva sūkṣmo bhūtvā śarīrāṇy adhitiṣṭhati sarvāṇi cāṅgāny abhimṛśati tasmād ucyate sūkṣmam /