ŚB 1.7.22

Arjuna was aware of the transcendental qualities of Lord Śrī Kṛṣṇa, as he had already experienced them during the Kurukṣetra War, in which both of them were present. Therefore, Arjuna’s version of Lord Kṛṣṇa is authoritative. Kṛṣṇa is almighty and is especially the cause of fearlessness for the devotees. A devotee of the Lord is always fearless because of the protection given by the Lord. Material existence is something like a blazing fire in the forest, which can be extinguished by the mercy of the Lord Śrī Kṛṣṇa. The spiritual master is the mercy representative of the Lord. Therefore, a person burning in the flames of material existence may receive the rains of mercy of the Lord through the transparent medium of the self-realized spiritual master. The spiritual master, by his words, can penetrate into the heart of the suffering person and inject knowledge transcendental, which alone can extinguish the fire of material existence.