So Kṛṣṇa began His teaching to Arjuna, chastising him that "You do not know anything; still, you are talking like a learned man." This is the fault of a person without any spiritual knowledge. Every man in this material world is almost without any spiritual knowledge. Still, they are proud of their learning, their knowledge, their degrees. This is going on. When Sanātana Gosvāmī approached Caitanya Mahāprabhu, he first of all presented himself as a person without knowledge. Sanātana Gosvāmī was coming of a very brāhmaṇa, aristocratic family. He was very learned scholar in Sanskrit and Urdu; still, he presented himself before Caitanya Mahāprabhu as a foolish man. So actually that is the position. He said, grāmya-vyavahāre paṇḍita, satya māni, āpanāra hitāhita kichui nā jāni (CC Madhya 20.100). He said that "These common men say that I am very learned paṇḍita, but I am such a rascal, I do not know what I am."
So this is the position for everyone. You ask any learned scientist, professor, "Who are you?" He'll say, "I am Mr. John." He'll say, "I am Mr. John, I am American," or "I am Mexican," "I am Indian," like that. So this is ignorance. Nobody is this body. That is the first lesson of spiritual knowledge. So long we identify with this body, that "I am Mr. Such-and-such," "I am American," "I am Indian," this is all ignorance. When you actually understand that you are not this body—therefore you are not American, nor Indian, nor Mexican, but you are spirit soul—then your spiritual education begins. And that is . . . In Sanskrit it is called ahaṁ brahmāsmi: "I am spirit soul." Spiritual . . . Spirit soul has no connection with this material world. When one understands fully this, I mean to say, fact, that spirit soul is different from this material world, then he's actually learned. In that stage he's called situated in brahma-bhūtaḥ stage. The symptom of brahma-bhūtaḥ is brahma-bhūtaḥ prasannātmā (BG 18.54). As soon as one becomes self-realized, he becomes jubilant, jolly. So long one identifies with this body, he is unhappy, full of anxiety.