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न हि ज्ञानेन सदृशं पवित्रमिह विद्यते ।
तत्स्वयं योगसंसिद्ध: कालेनात्मनि विन्दति  ॥

na hi jñānena sadṛśaṃ pavitram-iha vidyate
tat-svayaṃ yoga-saṃsiddha: kālenātmani vindati – 4.38 

There is nothing in this world so purifying as jñāna. In due course of time, one will automatically attain it in himself, by dint of the maturity and fruition of yoga pursuit.