अथ चैनं नित्यजातं नित्यं वा मन्यसे मृतम् ।
तथापि त्वं महाबाहो नैवं शोचितुमर्हसि ।।
atha cainaṃ nityajātaṃ nityaṃ vā manyase mṛtam ।
tathāpi tvaṃ mahābāho naivaṃ śocitumarhasi ।।
तस्मादपरिहार्येऽर्थे न त्वं शोचितुमर्हसि ।।
jātasya hi dhruvo mṛtyurdhruvaṃ janma mṛtasya ca ।
tasmādaparihārye'rthe na tvaṃ śocitumarhasi ।।
अव्यक्तनिधनान्येव तत्र का परिदेवना ।।
avyaktādīni bhūtāni vyaktamadhyāni bhārata ।
avyaktanidhanānyeva tatra kā paridevanā ।।
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Krishna now impresses upon Arjuna that if he thinks deha & atma are one and the same, even then there's no need to worry
That which is created will be destroyed & vice-versa. A person born, dies (along with perishable atma) & takes rebirth. There's no need to worry
The advise here is to stop worrying about things that get created, undergo changes & then get destroyed in an endless cycle
Since we don't know how body/atma looked like before we were born or after we die, there is surely no need to worry about it
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That which is born needs to die & vice-versa.
pancha-bhutas (elementals) which make up our body can't be seen before we are born. It can't also be seen after we die. They are visible only when we live. Why do you worry about it needlessly?
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Same as (V) & (A)