एवमुक्त्वाऽर्जुनः संख्ये रथोपस्थ उपाविशत्।विसृज्य सशरं चापं शोकसंविग्नमानसः॥
evam uktvārjunaḥ saṅkhye rathopastha upāviśatvisṛjya sa-śaraṃ cāpaṃ śoka-saṃvigna-mānasaḥ
Word by word
The verse says
Sanjaya said: Having spoken so, Arjuna sank down on the seat of the chariot in the middle of the battle, letting go of his bow and arrows, his mind overwhelmed with grief.
In plain words
He sits down.
The greatest archer alive puts down his weapon in the middle of a battlefield, between two armies waiting to begin, and sits.
That is how the first chapter of the Bhagavad Gita ends. Nothing is solved. A capable man has simply stopped being able to move.
Where you've felt this · in health
The moment you stop managing it. You have held something together for weeks by sheer effort, and then one ordinary afternoon you sit down on the stairs and do not get up. Nothing new has happened. Whatever was holding you has just run out.
Going deeper
Everything that follows in the next seven hundred verses is the answer to this image.
Hold on to it, because the Gita will return to it exactly. Here: a man sitting, bow cast away, mind overcome by sorrow — śoka-saṃvigna-mānasaḥ. At the very end of Chapter 18, having heard everything, Arjuna says his delusion is gone, that he stands firm, sthito 'smi, and will do as Krishna says. Sitting to standing. Bow dropped to bow taken up. Sorrow to steadiness.
Notice also what has not happened. Nobody has told him the war is just. No sign has appeared. His situation is exactly as impossible as it was twenty verses ago, and it will still be impossible at the end of the book. The Gita never fixes Arjuna's circumstances.
And notice where he is sitting — in the middle, between the two armies, in the place he asked to be driven to. That is where the whole teaching happens. Not in a forest or a temple, but in the worst possible spot, with no time, with everyone watching, in a position he chose himself and cannot get out of.
That is the Gita's real claim, made by its setting before a word of philosophy is spoken. This is not knowledge for people who have withdrawn from their lives. It is for someone stuck in the middle of one.