Bhagavad Gita Chapter 4 Verse 38
भगवद् गीता अध्याय 4 श्लोक 38

न हि ज्ञानेन सदृशं पवित्रमिह विद्यते।
तत्स्वयं योगसंसिद्धः कालेनात्मनि विन्दति।।4.38।।



हिंदी अनुवाद - स्वामी रामसुख दास जी ( भगवद् गीता 4.38)
।।4.38।।इस मनुष्यलोकमें ज्ञानके समान पवित्र करनेवाला दूसरा कोई साधन नहीं है। जिसका योग भलीभाँति सिद्ध हो गया है वह (कर्मयोगी) उस तत्त्वज्ञानको अवश्य ही स्वयं अपनेआपमें पा लेता है।


English Translation of Sanskrit Commentary By Sri Shankaracharya's
4.38 Hi, indeed; na vidyate, there is nothing; pavitram, purifying, sanctifying; iha, here; sadrsam, comparable; jnanena, to Knowledge. Yoga-samsiddhah, one who has become perfected, who as attained fitness through yoga-the seeker after Liberation who has become samsiddhah, purified, qualified; yogena, through the yoga of Karma and the yoga of concentration-; kalena, after a long time; vindati, realizes, i.e. attains; tat, That, Knowledge; verily svayam, by himself; atmani, in his own heart. That means by which Knowledge is invariably attained is being taught:


English Translation of Commentary  - Dr. S. Sankaranarayan
4.38 Na hi etc.  There exists no purifier similar to the knowledge.  The purity of other things  is due to the touch of  Consciousness and is not intrinsic.  This point is not elaborated here for fear of a  lengthy discussion.  This purifying nature of the knowledge, one would understand for himself on reaching the stage of being perfectly enlightened.


English Translation of Ramanuja's Sanskrit Commentary
4.38 Nothing here in this world purifies like this knowledge; for the knowledge of the self destroys all evil. He who has reached perfection by practising Karma Yoga in its form of knowledge daily in the manner taught, in due time, of his own accord, attaints it, i.e., knowledge concerning his own self.

Sri Krsna expounds the same lucidly thus:


Transliteration Bhagavad Gita 4.38Na hi jnaanena sadrisham pavitram iha vidyate;
Tat swayam yogasamsiddhah kaalenaatmani vindati.


Word Meanings Bhagavad Gita 4.38na—not; hi—certainly; jñānena—with divine knowledge; sadṛiśham—like; pavitram—pure; iha—in this world; vidyate—exists; tat—that; svayam—oneself; yoga—practice of yog; sansiddhaḥ—he who has attained perfection; kālena—in course of time; ātmani—wihtin the heart; vindati—finds