Bhagavad Gita · Chapter 4: Knowledge and the Renouncing of Action
Bhagavad Gita 4.38
न हि ज्ञानेन सदृशं पवित्रमिह विद्यते ।
तत्स्वयं योगसंसिद्धः कालेनात्मनि विन्दति ॥
na hi jñānena sadṛśaṃ pavitramiha vidyate | tatsvayaṃ yogasaṃsiddhaḥ kālenātmani vindati ||
Nothing in this world purifies like knowledge. One who is perfected in yoga finds it within the self in the course of time.
Modern context
Nothing purifies like knowledge, and the verse adds three things about how it comes. It comes of itself: a teacher can point, but each person has to see. It comes in time, when practice has ripened, and it cannot be hurried. It is found within, because it is the uncovering of something already there. This is a correction for impatience. If one keeps to the discipline, understanding arrives when the ground is ready.