Bhagavad Gita 1-46

sanjaya Uvaacha:

EvamuktvaarjunaHa sankhyE rathOpastha upaavishat

visRujya sashraM chaapaM shOkasaMvignamaanasaHa || 46 ||

Sanjaya said:

Having said thus, Arjuna overwhelmed by sorrow and grief set aside his bow and arrow and sat in his chariot in the middle of the battlefield.

Sanjaya was narrating this entire episode to Dhritaraashtra. He said that Arjuna was overwhelmed by sorrow, grief and guilt of possible destruction an entire family. He would not stand any more. He has said what he had to say. He has decided not to be a part of the war even if it means his own death. But he was unwilling to be responsible for the grave consequences of the war. He knew that if this war was fought whether he was party to it or not the consequences would be dire as he argued. Even though it was not in his scope to prevent this war he did not want to be a part of such a war with dreaded consequences. Thus he resigned, dropped down his weapons and sat in his chariot in the midst of the battle field.