Bhagavad Gita 18.26

मुक्तसङ्गोऽनहंवादी धृत्युत्साहसमन्वितः।सिद्ध्यसिद्ध्योर्निर्विकारः कर्ता सात्त्विक उच्यते॥

muktasaṅgo'nahaṃvādī dhṛtyutsāhasamanvitaḥ |siddhyasiddhyornirvikāraḥ kartā sāttvika ucyate ||

An agent who is free from attachment, non-egoistic, endowed with firmness and enthusiasm, and unaffected by success or failure, is considered to be of a Sattvic (pure) nature.

But when a person has no sentiment or ego, when they possess courage and confidence, not caring whether they succeed or fail, then their action arises from purity.

Our plain-language meaning of this verse is waiting for scholar review.