Real knowledge is to know oneself. That is being taught by Sanātana Gosvāmī, that "I do not know what I am. I am simply identifying myself with this body. That is not real knowledge."
Lecture on Teachings of Lord Caitanya -- Seattle, September 25, 1968:
Girl: "Teachings to Sanātana Gosvāmī."
Prabhupāda: Yes. Read it.
Girl: "In the instructions of Lord Caitanya to Sanātana Gosvāmī we can understand the science of God in the matter of His transcendental form, His opulences, and His devotional service, where everything is being described to Sanātana Gosvāmī by the Lord Himself. By that time Sanātana fell at the feet of the Lord and in great humility asked about his own real identity."
Prabhupāda: Read little slowly so that..., and loudly, so that others can hear.
Girl: "He spoke as follows. 'I am born of a lower family. My associations are all abominable and I am fallen. The most wretched of mankind, I was suffering in the dark well of material enjoyment, and I never knew the actual goal of my life. I do not know what is beneficial to me. Although in the mundane sphere I am what is known as a great learned man, I am in fact so much of a fool that I even accept that I am learned.' "
Prabhupāda: "I am...? I am so much fool that I accept...?" What is that?
Girl: "...that I am learned."
Prabhupāda: "I am learned." Now, this Sanātana Gosvāmī, he was formerly known as Dabira Khāsa. He was born in a high aristocratic family, brāhmaṇa family, and he was finance minister in the government of Nawab Hussain Shah, the then Bengal governor of Bengal. It is about five hundred years ago India was governed by the Pathans, Muslims, and in Bengal the governor was known as Nawab Hussain Shah. Under his government this Dabira Khāsa was minister of finance, and his brother also, Sākara Mallika, he was also a departmental minister. So both the brothers were in very high position. They were great scholar in Sanskrit and Parsi, Urdu. Parsi, Urdu, you know the language spoken in Arabia, in that part of the world. So they were very good scholar and born in very aristocratic family and associated with rich men, aristocratic persons. Because they were ministers, no ordinary person could mix with them. So that was their position. And when they met Lord Caitanya, they decided to retire from the service and propagate the movement of Lord Caitanya, Kṛṣṇa consciousness. So he resigned from the service. The Nawab was very much sorry. He did not like that he should resign from the service because the Nawab was so much dependent on his good service. But he decided that "I must resign." So some way or other he got rid of the service and approached Lord Caitanya in a very humble way. Now he's presenting himself before Lord Caitanya that "I am very low born, and my association is abominable. And people call me a very learned man, and I also accept that I am very learned man. But actually, I am not, because I do not know what I am." It is very nice picture, you see? In the Vedas the injunction is that if anyone wants to understand the transcendental science, he must approach to a bona fide person or a spiritual master in such humbleness as Sanātana Gosvāmī is approaching. He is born of a very high aristocratic family, but he says that "I am born very low." He's very learned man, but he says that "People say me learned man, but actually I am not." Just the position. So why he's saying that? That will be explained. Because actual learning means to know oneself. That is real knowledge. This knowledge that "I am American," "I am Indian," "I am born of this family," "I am father of this person," "husband of that lady," and this and that, so many designations, that is not real knowledge. Real knowledge is to know oneself. That is being taught by Sanātana Gosvāmī, that "I do not know what I am. I am simply identifying myself with this body. That is not real knowledge." He's presenting in that way. Read next.
Girl: "You have accepted me as Your servant and You have delivered me from the entanglement of material life. Now You can tell me what my duty is in this liberated state of life."
Prabhupāda: Now he, he was a minister. Now he thinks that after resigning this service he's feeling liberated. Because he hasn't got to obey somebody who is a materialistic person, therefore he's thinking liberated. And he's asking Caitanya Mahāprabhu, whom he has accepted as his master, "Now You have liberated me. Now You can say what is my duty." Go on.
Girl: "In other words, as we see by this plea, liberation is not the final word in perfection."
Prabhupāda: Yes. Here is one point. He says that "You have liberated me. Now let me know what is my duty." This is very important point. The Māyāvādī philosopher, they think that liberation is the ultimate goal. Just like in Buddha philosophy, the nirvāṇa. Nirvāṇa means annihilation of material existence. Nirvāṇa. They think that as soon as there is annihilation of this material existence, that is the final goal. The Māyāvādī philosopher or the impersonalist, they think that not only to get freedom from this material existence, but to remain in spiritual status, jñānam, simply in the knowledge that "I am spirit soul. I am merged into the spirit soul," that is their goal. But here, the Sanātana Gosvāmī, he belongs to the Vaiṣṇava philosophy. He says, "Now what is my duty?" That means after liberation it is not that everything is void or activity is stopped. No. Actually activity begins after liberation. At the present moment our activities are not liberated activities. At the present moment all our activities are conditional, but actually I am not... Because I am spirit soul, therefore I'm not under material condition. But somehow or other, I am now put into material conditions. This is also explained in the Bhagavad-gītā: brahma-bhūtaḥ prasannātmā [Bg. 18.54]. When one is actually liberated, brahma-bhūtaḥ, that is called brahma-bhūtaḥ. When one is not liberated he's called jīva-bhūtaḥ. Just like we are, ordinary living entities, we are under designations, and in the concept of this body, we are thinking everything. But actually I am not this body. I am not matter. I am a spirit soul. When this understanding comes, that is the point of liberation. And after that liberation, actual duty begins.