Bhagavad Gita 6.8
ज्ञानविज्ञानतृप्तात्मा कूटस्थो विजितेन्द्रियः | युक्त इत्युच्यते योगी समलोष्टाश्मकाञ्चनः ||६-८||
jñānavijñānatṛptātmā kūṭastho vijitendriyaḥ . yukta ityucyate yogī samaloṣṭāśmakāñcanaḥ ||6-8||
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Recitation
6.8 The Yogi who is satisfied with the knowledge and the wisdom (of the Self), who has conered the senses, and to whom a clod of earth, a piece of stone and gold are the same, is said to be harmonied (i.e., is said to have attained Nirvikalpa Samadhi).
A person is said to be established in self-realization and is called a yogī [or mystic] when he is fully satisfied by virtue of acquired knowledge and realization. Such a person is situated in transcendence and is self-controlled. He sees everything – whether it be pebbles, stones or gold – as the same.