vṛttiḥ --- kaṇṭhakūpasyādhastādyā kūrmākhyā nāḍī tasyāṃ kṛtasaṃyamasya cetasaḥ sthairyamutpadyate| tatsthānamanupraviṣṭasya cañcalatā na bhavatītyarthaḥ| yadi vā kāyasya sthairyamutpadyate na kenacit spandayituṃ śakyata ityarthaḥ ||31||