ज्ञानविज्ञानतृप्तात्मा कूटस्थो विजितेन्द्रियः। युक्त इत्युच्यते योगी समलोष्टाश्मकाञ्चनः ॥

jñāna-vijñāna-tṛiptātmā kūṭa-stho vijitendriyaḥ yukta ityuchyate yogī sama-loṣhṭāśhma-kāñchanaḥ

The Yogî who is satisfied with wisdom and knowledge, unwavering, whose senses are sub dued, to whom a lump of earth, a stone and gold are the same, is said to be harmonised.

In plain words: Krishna says a yogi (a person who practices yoga, the discipline of joining the mind with God) is content with what he knows and understands. He stays steady, controls his senses, and sees a lump of dirt, a stone and gold as having the same worth.