Bhagavad-gītā 18.26
BG 18.26
Open the full passageमुक्तसङ्गोऽनहंवादी धृत्युत्साहसमन्वितः । सिद्ध्यसिद्ध्योर्निर्विकारः कर्ता सात्त्विक उच्यते ॥२६॥
Sanskrit
mukta-saṅgo 'nahaṁ-vādī dhṛty-utsāha-samanvitaḥ siddhy-asiddhyor nirvikāraḥ kartā sāttvika ucyate
Translation
One who performs his duty without association with the modes of material nature, without false ego, with great determination and enthusiasm, and without wavering in success or failure is said to be a worker in the mode of goodness.