Now, to come to the real knowledge, real platform of knowledge, the cultivation is required. So cultivation is required. Suppose somebody has said, the same example, that there is fire in the wood. So if you simply remain satisfied with the wood—"There is fire"—that is called tamo-guṇa, not developed. Again, when there is smoke, that is another platform. But when one appreciates the flames of (the fire), that is sattva-guṇa. Therefore Kṛṣṇa says here, tri-vidhā bhavati śraddhā dehināṁ sā svabhāva-jā. If one is cultivating his life like hogs and cats and dogs—the behavior is also like that and remaining in that position—so his faith and one who is advanced, who is worshiping Deity, and having three times bath, and chanting mantras, Hare Kṛṣṇa, they are not equal. That is not possible because one is situated in the sattva-guṇa and the other is situated in tamo-guṇa, although the tamo-guṇas, the persons who are in the darkness of knowledge, they have got their faith. It is not that they have no faith. They have got faith. But that faith is in the lowest status of life. That faith will not help him for spiritual realization. Therefore Kṛṣṇa said, tri-vidhā bhavati śraddhā dehināṁ sā svabhāva-jā. Svabhāva-jā means natural. Because his body is not yet purified, therefore he remains in the status of tamo-guṇa or ignorance. Tri-vidhā bhavati śraddhā dehināṁ sā svabhāva-jā.
Therefore we have to change. Just like a man diseased, he can be changed into a healthy person provided he follows the medical rules and regulation, takes medicine, diet and... That is possible. So if one does not follow the regulation, rules and regulation, he remains there, diseased. It is not that, that "We have become now free. We can talk nonsensically and we can behave like nonsense. Still, we are advanced," That is not possible. Sāttvikī rājasī caiva tāmasī ceti tāṁ śṛṇu. How? What are the symptoms to know that one is situated in the sattva-guṇa or one is situated in the rajo-guṇa or one is situated in tamo-guṇa? By the symptoms. The symptoms are also mentioned. The sattva-guṇa means brāhmaṇa. Sattva-guṇa in brāhmaṇa, their symptoms are mentioned in the Bhagavad-gītā. Everything is there, characteristic. You have to test it. Just like in the chemistry there is analytical study, whether it is pure or not. So every chemical has got characteristics, Its color, its formation, its taste, so many things. Those who are chemists, they know how to test. So when the characteristic and the test of the chemical is found as "Yes, it is according to the standard," then it is accepted as a pure chemical, and it can be used for the purpose. And if it is adulterated... Everything... We are cooking food. If the ghee is pure, then taste is different. If the ghee is impure, the taste is different. And if it is not ghee at all. oil, the taste is different. It is like that.