Bhagavad Gita · 6.20

यत्रोपरमते चित्तं निरुद्धं योगसेवया।यत्र चैवात्मनात्मानं पश्यन्नात्मनि तुष्यति॥

yatroparamate chittaṁ niruddhaṁ yoga-sevayā yatra chaivātmanātmānaṁ paśhyann ātmani tuṣhyati

Where the mind, restrained by the practice of yoga, comes to rest; where, seeing the Self through the self, one finds satisfaction in the Self alone —

— Bhagavad Gita 6.20

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)