अथ चैनं नित्यजातं नित्यं वा मन्यसे मृतम् । तथापि त्वं महाबाहो नैवं शोचितुमर्हसि

atha cainaṃ nityajātaṃ nityaṃ vā manyase mṛtam tathāpi tvaṃ mahābāho naivaṃ śocitumarhasi

Krishna says that even if Arjuna believed life and death were a constant cycle with no deeper spiritual meaning, grief would still not solve anything.