देही नित्यमवध्योऽयं देहे सर्वस्य भारत।तस्मात्सर्वाणि भूतानि न त्वं शोचितुमर्हसि॥
dehī nityam avadhyo ’yaṃ dehe sarvasya bhāratatasmāt sarvāṇi bhūtāni na tvaṃ śocitum arhasi
Word by word
The verse says
The one who lives in the body — in everyone's body — can never be killed. So you have no reason to grieve for any living thing.
In plain words
The summing up, and Krishna widens it right at the end.
Not just Bhishma. Not just the men on this field. Everyone's body, and any living thing.
He has taken an argument built for one man's specific problem and let it out to cover everything alive.
Where you've felt this · in family life
You go in with one narrow question about your own situation. You come out with something that covers every version of it. You cannot un-know that afterwards. It changes far more than you asked about.
Going deeper
Sarvasya — of everyone. This one word closes the section and opens something much larger.
The argument began as a reply to Arjuna's grief about particular relatives. It ends as a statement about all embodied beings without exception, which includes the enemy, includes strangers, and includes Arjuna.
That widening will matter enormously later. The compassion the Gita ends up describing — Chapter 6's vision of seeing yourself in all beings, Chapter 12's list of the qualities Krishna loves — depends on exactly this move. If what is essential in everyone is the same, then the circle of concern has no natural edge.
So it is worth being clear about what these twenty verses have and have not done. They have not told Arjuna to stop caring. They have removed one specific belief — that he is about to annihilate people — and in removing it, quietly extended the caring past the people he happened to be related to.
And the philosophical section ends here. From verse 31 Krishna changes ground entirely, and starts talking about duty, reputation, and what happens to a man who walks away from a fight.