Chapter 18 · Liberation through Renunciation · Krishna said
Bhagavad Gita 18.45 — Perfection through own work
स्वे स्वे कर्मण्यभिरतः संसिद्धिं लभते नरः। स्वकर्मनिरतः सिद्धिं यथा विन्दति तच्छृणु ॥
sve sve karmaṇyabhirataḥ saṃsiddhiṃ labhate naraḥ | svakarmanirataḥ siddhiṃ yathā vindati tacchṛṇu ||
Meaning
Devoted to their own work, a person reaches the highest perfection. Hear how one engaged in their own work attains it.