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I published two commentaries on the Yoga Sutras under the titles of:
For indirect references to kundalini by Patanjali, see these verses:
Yoga Sutras 3.30-34
Chapter 3
Verse 30
नाभिचक्रे कायव्यूहज्ञानम्॥३०॥
nābhicakre kāyavyūhajñānam
By complete restraint of the mento-emotional energy in relation to the focusing on the navel energy-gyrating center, the yogi gets knowledge about the layout of his body.
Verse 31
कण्ठकूपे क्षुत्पिपासानिवृत्तिः॥३१॥
kaṇṭhakūpe kṣutpipāsā nivṛttiḥ
By the complete restraint of the mento-emotional energy in focusing on the gullet, a yogi causes the suppression of hunger and thirst.
Verse 32
कूर्मनाड्यां स्थैर्यम्॥३२॥
kūrmanāḍyāṃ sthairyam
By the complete restraint of the mento-emotional energy in focusing on the kurma nāḍi subtle nerve, a yogi acquires steadiness of his psyche.
Verse 33
मूर्धज्योतिषि सिद्धदर्शनम्॥३३॥
mūrdhajyotiṣi siddhadarśanam
By the complete restraint of the mento-emotional energy as it is focused on the shining light in the head of the subtle body, a yogi gets views of the perfected beings.
Verse 34
प्रातिभाद्वा सर्वम्॥३४॥
prātibhād vā sarvam
By complete restraint of the mento-emotional energy, while focusing on the shining organ of divination in the head of the subtle body, the yogin is able to know all reality.