Bhagavad Gita: Chapter 18, Verse 26
Sanskrit Verse
मुक्तसङ्गोऽनहंवादी धृत्युत्साहसमन्वितः।सिद्ध्यसिद्ध्योर्निर्विकारः कर्ता सात्त्विक उच्यते।।18.26।।
Transliteration
mukta-saṅgo ‘nahaṁ-vādī dhṛity-utsāha-samanvitaḥ
siddhy-asiddhyor nirvikāraḥ kartā sāttvika uchyate
Word meanings
mukta-saṅgaḥ—free from worldly attachment; anaham-vādī—free from ego; dhṛiti—strong resolve; utsāha—zeal; samanvitaḥ—endowed with; siddhi-asiddhyoḥ—in success and failure; nirvikāraḥ—unaffected; kartā—worker; sāttvikaḥ—in the mode of goodness; uchyate—is said to be
Swami Sivananda's translation
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.
Chapter link: Gita Chapter 18

Muni's Play