Chapter 6 · verse 8 · gita.yoga.org

Bhagavad Gita 6.8

ज्ञानविज्ञानतृप्तात्मा कूटस्थो विजितेन्द्रियः। युक्त इत्युच्यते योगी समलोष्टाश्मकाञ्चनः

The Yogi who is satisfied with the knowledge and wisdom of the Self, who has conquered the senses, and to whom a clod of earth, a piece of stone, and gold are all the same, is said to have attained Nirvikalpa Samadhi.