|Chapter 1: Observing the Armies on the Battlefield of Kurukshetra|
evam uktvarjunah sankhye
visrijya sa-saram capam
Sanjaya said: Arjuna, having thus spoken on the battlefield, cast aside his bow and arrows and sat down on the chariot, his mind overwhelmed with grief.
This is the final statement of Arjuna. After having carefully examined the pros-and-cons of the impeding war and stating his reasons succinctly Arjuna now expresses his conclusion, the he will not fight.
Arjuna's putting down his bow Gandiva is significant of the indecision. Previously he had been very determined to fight and had taken up the bow with the intention of shooting arrows. Now he put the bow down. He had also taken a vow to kill anyone who would even suggest that he put his bow down. So committed was he to his vow that later on in the Mahabharata once Yudhisthira in anger at being humiliated by Karna chastises Arjuna and asks him to lay his bow down since it seemed futile against Karna. At this time Arjuna remembering his vow prepared to kill Yudhisthira and only by the intervention of Sri Krishna (who stated that insulting was as good as killing) that a terrible situation was averted.
It I said that one's mind can be one's greatest friend and enemy as well. Here Arjuna is so tormented by doubts arising in his mind that he finally accepts defeat and after leaving the bow sits down.
Please read the Sanskrit Verse and the Prabhupada's Purport.