नियतं कुरु कर्म त्वं कर्म ज्यायो ह्यकर्मणः ।शरीरयात्रापि च ते न प्रसिद्ध्येदकर्मणः ॥
niyataṃ kuru karma tvaṃ karma jyāyo hyakarmaṇaḥ |śarīrayātrāpi ca te na prasiddhyedakarmaṇaḥ ||
Do your assigned action, for action is better than inaction. Without action, even keeping your body going would not be possible for you.
Explanation
Krishna is advising Arjuna, who wants to give up action, that withdrawing from all activity is not a real option. "Assigned action" (niyataṃ karma) is the duty that fits one's role and situation; commentators differ on whether this means ritual duties, social duties (dharma), or duties generally. Even basic survival needs effort, so doing one's duty is better than doing nothing.