Bhagavad Gita 14.23

He who maintains an attitude of indifference, who is not disturbed by the qualities, who realizes that it is only they who act, and remains calm;

उदासीनवदासीनो गुणैर्यो न विचाल्यते।गुणा वर्तन्त इत्येव योऽवतिष्ठति नेङ्गते॥

udāsīnavadāsīno guṇairyo na vicālyate|guṇā vartanta ityeva yo'vatiṣṭhati neṅgate||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).