The Yoga of Renunciation

Krishna describes the yogi who is established in Brahman: one with steady intellect (sthira-buddhiḥ), not deluded (asammūḍhaḥ), who knows Brahman (brahma-vit) and is established (sthitaḥ) in Brahman (brahmaṇi). Such a person does not rejoice (na prahṛṣyet) on obtaining what is pleasant (priyaṁ prāpya), nor is agitated (na udvijet) on obtaining what is unpleasant (apriyam prāpya). This is the practical sign of being established in Brahman—equanimity in pleasure and pain. The yogi doesn't get excited by success or depressed by failure—they remain steady because they're established in Brahman, which is beyond dualities. This is the state of true karma yoga—acting in the world while remaining unaffected by its dualities.