Pradyumna: (reading) "Let me offer my respectful obeisances unto the lotus feet of Śrīla Rūpa Gosvāmī Prabhupāda and of Śrīla Bhaktisiddhānta Sarasvatī Gosvāmī Prabhupāda by whose inspiration I have been engaged in the matter of compiling this summary study of Bhakti-rasāmṛta-sindhu. This is the sublime science of devotional service as propounded by Śrī Caitanya Mahāprabhu, who appeared 500 years ago in West Bengal, India, to propagate the movement of Kṛṣṇa consciousness. Śrīla Rūpa Gosvāmī begins his great book by offering his respectful obeisances unto Śrī Sanātana Gosvāmī who is his elder brother and spiritual master, and he prays that Bhakti-rasāmṛta-sindhu may be very pleasing to him."
Prabhupāda: Yes.
Pradyumna: "He further prays..."
Prabhupāda: Our... Śrīla Rūpa Gosvāmī wanted to please Sanātana Gosvāmī. Our duty is to please the superior, not the public. We are giving service to the public according to the direction of the superior authority. We do not manufacture any program of service. That is not our business. Whatever is ordered by the... Just like Caitanya Mahāprabhu. Caitanya Mahāprabhu, He's Kṛṣṇa Himself. Still, He was following the authorities. Śrī Kṛṣṇa, Bhagavān, the Supreme Personality, He was also referring to the Brahma-sūtra: brahma-sūtra-padaiś caiva viniścitam. So this is the way, that any bona fide spiritual propaganda must be following the footsteps of previous authority.
At the present moment, it has become a fashion to manufacture some idea. But that is not the Vedic way. Vedic way is to receive the message through paramparā system. Evaṁ paramparā-prāptam imaṁ rājarṣayoḥ viduḥ (BG 4.2). Not to deviate the paramparā. So Sanātana Gosvāmī was taught by Śrī Caitanya Mahāprabhu continually for two months personally in Benares, Vārāṇasī. Therefore he's our authority. The Hari-bhakti-vilāsa, the Gauḍīya Vaiṣṇava sampradāya, they follow the principles of Hari-bhakti-vilāsa. In that Hari-bhakti-vilāsa Sanātana Gosvāmī recommends, tathā dīkṣā-vidhānena dvijatvaṁ jāyate nṛṇām. Dīkṣā-vidhāna, by the process of dīkṣā, a, any human being can be elevated to the position of a bona fide brāhmaṇa. Vidhānena. Vidhāna. The very word is used, vidhāna. Vidhāna means bona fide process. Tathā dīkṣā-vidhānena. There is another good suggestion: yathā kañcanatāṁ yāti kaṁsa-rasa-vidhānena. Rasa. Rasa means ... Another meaning of rasa means... What is that? What is called? I forget. The metal...?
Devotee: Bell metal.
Prabhupāda: Eh?
Pradyumna: Bell metal?
Prabhupāda: No, not bell... That liquid metal.
Devotees: Mercury.
Prabhupāda: Mercury. Mercury. Hydrox... What is called? Hydroid?
Devotee: Quicksilver?
Prabhupāda: No. Another name is hydrogeroid. That is the chemical name of mercury. You know it. Hydrogeroid? Yes. Unguentum hydrogeroid. Yes. That is another name of the mercury. Hydrogeroid. So in Sanskrit it is called rasa. Rasāyana. From mercury, rasa, the chemistry is called rasāyana-śāstra. Actually, rasāyana-śāstra, chemical composition, begins from mercury and sulphur. That is the beginning of chemical composition. So rasa-vidhānena, by chemical interaction of sulphur and mercury, if you can add tin and copper, then it becomes gold. You can manufacture gold, provided you know the process, how to mix up copper, tin and mercury. With via media of sulphuric acid. Sulphuric acid is the mother of chemicals. Without sulphur, you cannot make any chemical composition. Therefore all chemical composition are called sulphate, sulphite, like that. So Sanātana Gosvāmī gives this idea of chemical composition. It appears that he knew how to work with chemicals.