BG 4.38
न हि ज्ञानेन सदृशं पवित्रमिह विद्यते। तत्स्वयं योगसंसिद्धः कालेनात्मनि विन्दति
na hi jñānena sadṛiśhaṁ pavitramiha vidyate tatsvayaṁ yogasansiddhaḥ kālenātmani vindati
There is nothing in the world so purifying as wisdom; and he who is a perfect saint finds that at last within himself.
Translated by Shri Purohit Swami
Verily, there is no purifier in this world like knowledge. He who is perfected in Yoga finds it within the Self in due time.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
na—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