Indian man (2): How could I know the unknown with the known?
Prabhupāda: This is already explained. How could you know your great-grandfather? From the paramparā system. Your father says, "Yes, I had my grandfather." So from the authority of your father you can understand. This is easy process. Evaṁ paramparā-prāptam imaṁ rājarṣayo viduḥ (BG 4.2). You have to hear. Therefore Veda is called śruti. Śruti means you have to hear from the right source. Then you know. That is knowledge. You don't hear from a cheater. You hear from the right source. Then the knowledge is perfect.
Devotees: Jaya Śrīla Prabhupāda.
Indian man (3): If a man is highly religious, it is very difficult for him to move in material world. What is the subject? How should he move, the people who are materialistically-minded?
Prabhupāda: Yes. Therefore you have to understand your spiritual identification. Because you are fools and rascals, you are thinking, "I am this body," and Kṛṣṇa gives instruction in the beginning that you are not this body. Dehino 'smin yathā dehe kaumāraṁ yauvanaṁ jarā (BG 2.13). Asmin dehe: you are within this body, not this body you are. So Kṛṣṇa is authority. You have to take it. Kṛṣṇa is not only simply speaking authoritatively, but He is giving practical example. Dehino 'smin yathā dehe kaumāraṁ yauvanaṁ jarā (BG 2.13). Because the soul is within this body, it is changing. Tathā dehāntara-prāptir dhīras tatra na muhyati (BG 2.13). You have to become a dhīra, not adhīra. There are two classes of men: dhīra and adhīra. So in order to become a dhīra, you have to go . . . Tad-vijñānārthaṁ sa gurum evābhigacchet (MU 1.2.12). You have to be trained up. Then you'll understand; not so quickly, without being dhīra. Dhīras tatra na muhyati.
Indian man (4): What is the difference between mind and soul?
Prabhupāda: Mind is material; soul is spiritual. That is explained in the Bhagavad-gītā: bhūmir āpo 'nalo vāyuḥ khaṁ mano buddhir eva ca, apareyaṁ bhinnā me prakṛtir aṣṭadhā (BG 7.4). They are also elements, but bhinnā means material, separated from Kṛṣṇa. Apareyam itas tu viddhi me prakṛtiṁ parām: "These material elements, they are inferior quality, and beyond this, there is another, superior quality. That is soul." Jīva-bhūtāṁ mahā-bāho yayedaṁ dhāryate jagat (BG 7.5). So you have to know from the books. That you'll no understand.