Yoga Sūtra Chapter Three verse 31

कूर्मनाड्यां स्थैर्यम् ॥३१॥

kūrma-nāḍyāṃ sthairyam ||31||

On tortoise channel, steadfastness.

kūrma - tortoisenāḍī - channelsthairya - steadfastness, steadiness
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