Bhagavad Gita · Chapter 2: The Path of Understanding
Bhagavad Gita 2.18
अन्तवन्त इमे देहा नित्यस्योक्ताः शरीरिणः ।
अनाशिनोऽप्रमेयस्य तस्माद्युध्यस्व भारत ॥
antavanta ime dehā nityasyoktāḥ śarīriṇaḥ | anāśino'prameyasya tasmādyudhyasva bhārata ||
These bodies of the eternal, indestructible, and immeasurable embodied self are said to come to an end. Therefore fight, Arjuna.
Modern context
'Therefore fight' is addressed to one man, a soldier in a war that every attempt at peace had failed to prevent. It is not a general licence for violence. The wider meaning is this: do not let the fear of endings stop you from doing what is rightly yours to do. Bodies end whether we act or not; what matters is whether we met our responsibility.