Bhagavad Gita: Chapter 2, Verse 6

न चैतद्विद्मः कतरन्नो गरीयो
यद्वा जयेम यदि वा नो जयेयुः ।
यानेव हत्वा न जिजीविषाम-
स्तेऽवस्थिताः प्रमुखे धार्तराष्ट्राः ॥ २-६ ॥

na caitad vidmaḥ kataran no garīyo
yad vā jayema yadi vā no jayeyuḥ
yān eva hatvā na jijīviṣāmas
te ’vasthitāḥ pramukhe dhārtarāṣṭrāḥ 2.6

We do not even know the result of this war, we conquering or us getting conquered. If we kill the sons of Dhritarashtra, we should not care to live. Yet they stand before us on the battlefield.