Chapter 4 · verse 39 · gita.yoga.org

Bhagavad Gita 4.39

श्रद्धावाँल्लभते ज्ञानं तत्परः संयतेन्द्रियः। ज्ञानं लब्ध्वा परां शान्तिमचिरेणाधिगच्छति

The one who is full of faith, devoted to it, and has subdued their senses obtains this knowledge; and upon obtaining the knowledge, they attain the supreme peace immediately.