Chapter XVIII · Śloka 26
मुक्तसङ्गोऽनहंवादी धृत्युत्साहसमन्वितः ।
सिद्ध्यसिद्ध्योर्निर्विकारः कर्ता सात्त्विक उच्यते ॥
सिद्ध्यसिद्ध्योर्निर्विकारः कर्ता सात्त्विक उच्यते ॥
mukta-saṅgo 'nahaṃvādī dhṛty-utsāha-samanvitaḥ |
siddhy-asiddhyor nirvikāraḥ kartā sāttvika ucyate ||
siddhy-asiddhyor nirvikāraḥ kartā sāttvika ucyate ||
Free from attachment, without ego-talk, endowed with steadiness and enthusiasm, unchanged in success and failure — such an agent is called sāttvika.
The sāttvika doer is the karma-yogī in full flower: liberated from clinging, free of self-advertisement, constant in energy and equanimity regardless of outcome. This portrait closes the first movement of Krishna's answer.