Bhagavad Gita 3.8
नियतं कुरु कर्म त्वं कर्म ज्यायो ह्यकर्मणः । शरीरयात्रापि च ते न प्रसिद्ध्येदकर्मणः ॥
niyataṃ kuru karma tvaṃ karma jyāyo hy akarmaṇaḥ | śarīra-yātrāpi ca te na prasiddhyed akarmaṇaḥ ||
Translation
Do you perform prescribed action, for action is superior to inaction; and the support of your body even cannot be maintained without action.
Reflection
What is the work with your name on it that you have been waiting for permission to begin?
Read this verse in its chapter: Chapter Three
Niyataṃ. The work assigned. The chapter narrows from action-in-general to your-action-in-particular. Krishna gives the smallest argument first: even keeping your body upright requires action. Then the larger: the work that has your name on it sits above doing nothing, even spiritually-styled nothing. Śarīra-yātrā, the body's journey. The basic continuation of being alive is already on the action side of the line. The verse refuses to let Arjuna pretend that not-fighting is the same as not-doing. He will still be eating, walking, talking. The choice is what he does with the rest.