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Verily, there is no purifier in this world like knowledge. He who is perfected in Yoga finds it in the Self in time.

There is nothing in this world as purifying as knowledge. One who is perfected in yoga finds it in himself in due time.

Krishna declares that nothing purifies like knowledge (jñāna). He then adds that one who has matured through yoga finds this knowledge within himself in time. This balances the earlier verse about learning from teachers. Knowledge is received from those who have seen the truth, but it also ripens from within through practice. Both are needed. The phrase in due time, kālena, recognises that spiritual growth is gradual. Arjuna is not expected to grasp everything at once, but to walk a path that leads there.