Arjuna is the greatest archer of his age. Before the first arrow, his bow Gāṇḍīva slips from his hand, his skin burns and he cannot stand. The Gītā begins with a hero falling apart.
Going deeper
1.30 continues the account Arjuna begins in 1.29, where his limbs have weakened, his mouth has gone dry, his body trembles and his hair stands on end. In 1.30 the bow Gāṇḍīva slips from his hand, his skin burns, he cannot stand and his mind seems to be whirling. The man describing this is the archer the story calls the greatest of his age, and he is describing himself, in the first person, to Kṛṣṇa. 1.31 moves from the body to the reasons: he sees bad omens and can see nothing good in killing his own people in battle. The Gītā starts from here, with a hero who can no longer stand, and everything Kṛṣṇa teaches later answers it. You can read the scene in chapter 1, and what the Gītā says about fear collects related verses.