यत्प्रालेयं प्रहितसुषिरं मेरुमूर्धान्तरस्थं तस्मिंस्तत्त्वं प्रवदति सुधीस्तन्मुखं निम्नगानाम् । चन्द्रात्सारः स्रवति वपुषस्तेन मृत्युर्नराणां तद्बध्नीयात्सुकरणं अधो नान्यथा कायसिद्धिः ॥ ३.५२ ॥

yatprāleyaṃ prahitasuṣiraṃ merumūrdhāntarasthaṃ tasmiṃstattvaṃ pravadati sudhīstanmukhaṃ nimnagānām । candrātsāraḥ sravati vapuṣastena mṛtyurnarāṇāṃ tadbadhnīyātsukaraṇaṃ adho nānyathā kāyasiddhiḥ ॥ 3.52 ॥

On the top of the merû (the vertebral column), concealed in a hole, is the Somarasa (the nectar of Chandra); the wise, whose intellect is not overpowered by the Rajas and Tamas gunas, but in whom the Sattva guna is predominant, say that the âtma (universal spirit) is there. It is the source of the descending Idâ, Pingalâ and Sushumnâ Nâdis, which are called the Ganges, the Yamuna and the Sarashvati. The essence of the body drips from the Chandra, and this causes the death of mortals. It should, therefore, be prevented from descending. This (Khechari Mudrâ) is a very good instrument for this purpose. There is no other means of achieving this end.