So mind. It is expansion of the mind, different way. Mānasa-vṛtti. This is called the characteristic of the mind. Then subtle action of mind: thinking, feeling, willing. And the mind is expanding in hundreds, thousands, millions of ideas. In this way I am becoming entangled. So when this mind is controlled... The yoga system is for that purpose. Those who are too much bodily concept of life, bodily consciousness, they should practice this yoga—haṭha-yoga, aṣṭāṅga-yoga—so that the mind can be purified. As soon as the mind is purified, then all this expansion into thousands and millions of ideas will be controlled, and the only idea will be Kṛṣṇa. This is called yoga system, concentrating. Dhyānāvasthita yogena paśyanti yaṁ yoginaḥ. Dhyānāvasthita-manasā: "The mind is controlled, and the focus of the mind is on Kṛṣṇa or Viṣṇu." Dhyānāvasthita-tad-gatena manasā paśyanti yaṁ yoginaḥ (SB 12.13.1). Then we can see the effulgence, and the localized, and then the Supreme Personality of Godhead.
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 manasa 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? 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.
In this way Caitanya Mahāprabhu has advised that harer nāma harer nāma harer nāmaiva kevalam (CC Adi 17.21). In this age, Kali-yuga, it is very difficult to perform the yoga system. This is also yoga, bhakti-yoga. Other yoga system is very difficult to execute. It is not possible. Even if it is possible—it may be possible for one or two persons—but bhakti-yoga is so nice that even a small child can practice it. We see practically the small children, they also taking part in it, without any education, without any culture, without any knowledge, automatically chanting, dancing, taking caraṇāmṛta, offering respect to the Vaiṣṇava. Automatically it is becoming. And that makes his life successful. Bhakti-yoga is so nice. Svalpam apy asya dharmasya trāyate mahato bhayāt (BG 2.40). Even little bit practiced, it will never go in vain. It will be an asset. Kṛta-puṇya-puñjāḥ (SB 10.12.11). In this way... Just like if you put a one single paisa in the bank deposit, that is your money. It will be never lost. And when it becomes a lump sum, the bank asks you to... Credit you get, one hundred rupees or similar. Similarly, bhakti-yoga is so nice that whatever you acquire, intentionally or unintentionally, even if you neglectfully chant Hare Kṛṣṇa by imitating others, by joking others, it will have effect.