Yoga Sutra 3.39 mastering the upgoing vital current udana

Sūtra III.39 By mastering the upgoing vital current (udāna), he passes untouched over water, mud, thorns and so on, and at death he takes the upward course Life is the operation of the totality of the senses, as prāṇa, etc. Its activity is five-fold. Prāṇa has its operation passing through the nostrils of the face as far as the heart; the samāna life-current, so-called because it evenly (sama) guides (āna), i.e. functions, as far as the navel; apāna is so-called because it guides (āna) down (apa), operating down to the soles of the feet; udāna leads upward (ūrdhvam), having its operation from the soles to the top of the head; pervading all is the vyāna life-current. Of them, prāṇa is the principal one. By mastering the udāna, he passes untouched over water and thorns and so on. Having mastered it, at death he takes the upward course. By mastering the …

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