Bhagavad Gita Chapter 6, Verse 8

ज्ञानविज्ञानतृप्तात्मा कूटस्थो विजितेन्द्रियः | युक्त इत्युच्यते योगी समलोष्टाश्मकाञ्चनः ||

jñāna-vijñāna-tṛptātmā kūṭastho vijitendriyaḥ yukta ity ucyate yogī sama-loṣṭāśma-kāñcanaḥ

One who is self-satisfied through knowledge and wisdom, who is unwavering and has conquered the senses, is said to be established in yoga. Such a yogi sees clay, stone, and gold as equal.

Krishna describes the qualities of one who is truly established in yoga. 'Jñāna-vijñāna-tṛptātmā'—one who is self-satisfied (tṛpta-ātmā) through knowledge (jñāna) and wisdom (vijñāna). This means: the yogi finds contentment not in external things, but in inner knowledge and wisdom. They're satisfied from within. 'Kūṭasthaḥ'—unwavering, steadfast. This means: they don't waver, they're stable, constant. 'Vijitendriyaḥ'—one who has conquered the senses. This means: they've mastered their senses, they're not controlled by them. 'Yukta ity ucyate yogī'—such a person is said to be established in yoga (yukta). 'Sama-loṣṭāśma-kāñcanaḥ'—sees clay (loṣṭa), stone (aśma), and gold (kāñcana) as equal (sama). This means: they don't value material things differently—a clod of earth and gold are the same to them. They're free from attachment to material possessions. This is the mark of true yoga—contentment from within, unwavering stability, mastery of senses, and equal vision toward all material things.