Yoga Sūtra Chapter Three verse 50

तद्वैराग्यादपि दोषबीजक्षये कैवल्यम् ॥५०॥

tat-vairāgyāt-api doṣa-bīja-kṣaye kaivalyam ||50||

Dispassion towards that,
also diminishes seed defect;
abstraction.

tat - that, thisvairāgya - dispassion, disinclination, detachment, non-attachment; indifference to worldly objects and to lifeapi - even, also, although; very; something more; moreoverdoṣa - affection, defect, fault, biological humoursbīja - seedkṣaya - diminish, wasting or wearing awaykaivalya - independence, freedom, emancipation, solitude, isolation, aloneness, separateness, abstraction, not connected with anything else; uncompounded, unmingled
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Commentaries and Reflections

Commentary by S Ramaswami:

“By keeping the Saṃyama on Puruṣa Prakṛti Viveka he realises even this knowledge is only an aspect of the mind and Prakṛti. So even that understanding or knowledge is given up as having no use.
Here is the start of Nirodha Pariṇāma.

Even Sattva must be given up as it is still an expression of Prakṛti and something to be overcome.
So by Nirodha Saṃskāra one develops dispassion to the Siddhi arising out of Saṃyama on Puruṣa Prakṛti Viveka.

By this one gets to Kaivalya and Prakṛti ceases to act.”