अथ चैनं नित्यजातं नित्यं वा मन्यसे मृतम्। तथापि त्वं महाबाहो नैवं शोचितुमर्हसि॥
atha chainam nitya-jatam nityam va manyase mritam tathapi tvam mahabaho naivam shochitum arhasi
Translation
But even if you think the soul is perpetually born and perpetually dies, still, O mighty-armed one, you should not grieve.
Commentary
Krishna addresses an alternative viewpoint - even if one does not believe in the eternal soul and thinks beings are simply born and die, grief is still irrational because death is then a natural, inevitable process.
wisdomknowledgewisdom, clarity