Verse
न हि ज्ञानेन सदृशं पवित्रमिह विद्यते ।तत्स्वयं योगसंसिद्धः कालेनात्मनि विन्दति ॥
na hi jñānena sadṛśaṃ pavitramiha vidyatetatsvayaṃ yogasaṃsiddhaḥ kālenātmani vindati
There is nothing in the world equal in purity to knowledge, the man who is perfected by Yoga, finds it of himself in the self by the course of Time.
Gītā 4·38