Chapter 6 · The Yoga of Meditation · Krishna said
Bhagavad Gita 6.8 — Earth and gold alike
ज्ञानविज्ञानतृप्तात्मा कूटस्थो विजितेन्द्रियः। युक्त इत्युच्यते योगी समलोष्टाश्मकाञ्चनः ॥
jñānavijñānatṛptātmā kūṭastho vijitendriyaḥ | yukta ityucyate yogī samaloṣṭāśmakāñcanaḥ ||
Meaning
The yogi content with knowledge and realisation, unshakeable, master of the senses, to whom a lump of earth, a stone and gold are the same, is called steady in yoga.