Prabhupāda: Yes. The matter, material nature, is forced upon him. Kāraṇaṁ guṇa-saṅgo 'sya sad-asad-janma-yoniṣu (BG 13.22). He is accepting different bodies according to the contamination of material nature. Kāraṇaṁ guṇa-saṅgo 'sya. That he does not know. Ahāṅkara-vimūḍhātmā kartāham iti manyate (BG 3.27). He does not know that there is a superior karta, daiva netreṇa. Karmaṇā daiva netreṇa jantu deha upapattaye (SB 3.31.1). So he is forced to accept a certain kind of body by the material nature. That he does not know. This is non-Āryan. Like dog: he does not know that why he has got this dog's body. He simply has learned how to bark, that's all.
Dr. Patel: (laughs) I have my doubts. How can we know that he is not knowing or knowing? It is our conjecture that he is not knowing.
Prabhupāda: No, no. Śāstra says. You conjecture, but we don't conjecture. We simply repeat what is said in the śāstra. Śāstra-cakṣuṣāt. "Your eyes should be the śāstra, not conjecture." Śāstra says, kāraṇaṁ guṇa-saṅgo 'sya. He has become a dog on account of his infection with certain type of material quality. That is our eyes. We don't conjecture anything. It is naturally may be inquired that, "Why one living entity has got this body of a dog and why one living entity has got the body of King Indra?" The śāstra-cakṣuṣāt: kāraṇaṁ guṇa-saṅgo 'sya. Śāstra says; Kṛṣṇa says. So it is, reason is, that he has infected the certain type of material modes of nature; therefore he has got. It is very easy. As you, medical man, you know how the disease has come, you have infected the disease. It is that.
Dr. Patel: Kāraṇaṁ sanga.