Sanskrit
एवमुक्त्वाऽर्जुनः सङ्ख्ये रथोपस्थ उपाविशत् । विसृज्य सशरं चापं शोकसंविग्नमानसः ॥
evam uktvārjunaḥ saṅkhye rathopastha upāviśat visṛjya saśaraṃ cāpaṃ śokasaṃvignamānasaḥ
Translation
Sanjaya said: Having thus spoken on the battle-field, Arjuna sank down on the seat of the chariot, casting away his bow and arrow, his mind overborne by grief.
Annie Besant · The Bhagavad-Gita, translated by Annie Besant (4th ed., 1922) — Wikisource · Public Domain
Explanation
Chapter 1 closes on an image, not an argument: Arjuna, having said everything he has to say, drops his bow and sinks down in his own chariot. The Sanskrit colophon that follows this verse names the whole chapter “Arjuna-viṣāda-yoga” — the Yoga of Arjuna’s Despondency — and this collapse is exactly what Krishna’s teaching, opening in the very next verse of Chapter 2, responds to directly.