Bhagavad Gita Chapter 2, Verse 48

योगस्थः कुरु कर्माणि सङ्गं त्यक्त्वा धनञ्जय । सिद्ध्यसिद्ध्योः समो भूत्वा समत्वं योग उच्यते ॥

yoga-sthaḥ kuru karmāṇi saṅgaṁ tyaktvā dhanañjaya | siddhy-asiddhyoḥ samo bhūtvā samatvaṁ yoga ucyate ||

Perform your actions established in yoga, abandoning attachment, O Arjuna, and be the same in success and failure. This evenness of mind is called yoga.

Krishna redefines yoga radically: not mystical practices, but 'samatvam'—equanimity. 'Yoga-sthaḥ kuru karmāṇi'—perform your duties from inner steadiness. How? 'Saṅgaṁ tyaktvā'—abandon attachment to outcomes. 'Siddhy-asiddhyoḥ samo bhūtvā'—remain even in success or failure. This isn't apathy; it's freedom from emotional hijacking. Your peace doesn't depend on results. You give your best, then stay centered whether you succeed or fail. Why? You've done what you control (your effort) and released what you don't (outcomes). That's yoga—unshakeable steadiness in an unsteady world.