So any system of yoga, either haṭha-yoga, jñāna-yoga, or... Karma-yoga is in the lowest standard. And above all, bhakti-yoga. Then, when you come to the bhakti-yoga, that is the perfection of life. Bhakti-yogena manasi samyak praṇihite amale (SB 1.7.4). Bhakti-yogena amala: "The mind becomes cleansed." Ceto-darpaṇa-mārjanam (CC Antya 20.12). That is the effect of..., direct effect of bhakti-yoga, because the mind is now contaminated, and under the creation of senses and sense activities, we are making millions and trillions of ideas and become entangled in that idea. We have to accept millions and trillions of body and then go on in the cycle of birth, death, old age and disease. This is implication. So purify the mind. That is the chanting of Hare Kṛṣṇa mahā-mantra. Ceto-darpaṇa-mārjanaṁ bhava-mahā-dāvāgni-nirvāpaṇam. When our mind is cleansed... This is mahā-dāvāgni. This expansion of mental ideas, thousands and millions, that is mahā..., bhava-mahā-dāvāgni. Bhava-mahā-dāvāgni. So it is the duty of guru to get out his disciple from the bhava-mahā-dāvāgni. Saṁsāra-dāvānala-līḍha-loka-trāṇāya kāruṇya-ghanāghanatvam **. Kāruṇya, kāruṇya.
So what is the guru? Guru has received the kāruṇya. Kāruṇya means just like the cloud has received water from the sea, similarly, a guru, spiritual master, receives the cloud of mercy from the ocean of kindness of Kṛṣṇa. Ghanāghanatvam. And it is only the cloud that can extinguish the forest fire, saṁsāra. No other watering system will be helpful. If there is fire in the forest, your fire brigade or buckets of water will not help. It is impossible. Neither you can go there; neither you can render any service by your fire brigade and bucket. Then how the fire can be extinguished? Now, ghanāghanatvam. If there is cloud in the sky and if there is rainfall, then the expansive forest fire can immediately be extinguished. So that cloud is supposed to be the spiritual master. He pours water. He pours water. Śravaṇa-kīrtana-jale karaye secana (CC Madhya 19.152). What is that water? The water is this śravaṇa-kīrtana. Bhava-mahā-dāvāgni, the fire, the forest fire of material existence, is blazing continually. So you have to extinguish it by the rainfall from cloud, and that rainfall means śravaṇa-kīrtana. Śravaṇa means hearing, and kīrtana means chanting. This is the only way. Śravaṇa-kīrtana-jale karaye secana.