Karmanye Vadhikaraste

In Devnagari: कर्मण्ये वाधिकारस्ते म फलेषु कदाचना कर्मफलेह्तुर भुरमा ते संगोस्त्वकर्मानी॥ च २, ४७

In English transliteration: Karmanye vadhikaraste ma phaleshu kadachna Karmaphalehtur bhurma te sangostvakarmani. Ch. 2, 47

In English translation: You have a right to perform your prescribed duty, but you are not entitled to the fruits of action।

Never consider yourself the cause of the results of your activities, and never be attached to not doing your duty.