Bhagavad Gita 6.8

ज्ञानविज्ञानतृप्तात्मा कूटस्थो विजितेन्द्रिय: |
युक्त इत्युच्यते योगी समलोष्टाश्मकाञ्चन:

Translation

The yogi who are satisfied by knowledge and discrimination, and have conquered their senses, remain undisturbed in all circumstances. They see everything—dirt, stones, and gold—as the same.