Bhagavad Gita 18.45

स्वे स्वे कर्मण्यभिरत: संसिद्धिं लभते नर: |
स्वकर्मनिरत: सिद्धिं यथा विन्दति तच्छृणु

Translation

By fulfilling their duties, born of their innate qualities, human beings can attain perfection. Now hear from Me how one can become perfect by discharging one’s prescribed duties.