The verse you are referring to is from Chapter 4, Verse 10 of the Bhagavad Gita, a sacred Hindu scripture. In this verse, Lord Krishna imparts wisdom to Arjuna, emphasizing the power of belief and the impact it has on an individual's life. The verse is as follows:
"वीतरागभयक्रोधा मन्मया मामुपाश्रिताः। बहवो ज्ञानतपसा पूता मद्भावमागताः॥"
Transliteration: "Vītarāga-bhaya-krodhā man-mayā mām upāśritāḥ Bahavo jñāna-tapasā pūtā mad-bhāvam āgatāḥ."
Translation: "Being freed from attachment, fear, and anger, being fully absorbed in Me and taking refuge in Me, many persons in the past became purified by knowledge of Me—and thus they attained My divine love."
In this verse, Lord Krishna teaches that those who cultivate detachment, fearlessness, and freedom from anger and ego, while wholeheartedly surrendering themselves to the Divine, attain purification and divine love. The verse highlights the significance of one's beliefs and the transformative power of devotion and self-realization.