Tattva-darśinaḥ, "who has seen the truth," not imagination. He cannot be guru. Who has actually seen, tattva-darśinaḥ. These are the injunction in the śāstras, and Parīkṣit Mahārāja is strictly following the same principles and asking Parīkṣit. . ., Śukadeva Gosvāmī, bhavanto jānate yathā: "As you have learned from your predecessor." So that is perfect knowledge. The knowledge is coming from Kṛṣṇa. Kṛṣṇa is all-perfect, and Arjuna is hearing directly from Him, and the statement of Arjuna is there in the Bhagavad-gītā. He understands that Kṛṣṇa is the Supreme Personality of Godhead; that is, he acquired knowledge from Kṛṣṇa.
So here the question is. . . This question is . . . (indistinct) . . . almost inquired by intelligent persons, that "We have come to this material world and suffering, but the living entity is part and parcel of Kṛṣṇa, or God. How he has come to this material world?" That is very intelligent question. Therefore it is said here, yadṛcchayā: "It is automatically, by nature's law," or hetunā, "or there is some cause? Whether there is any cause about the living entities coming down in this material world? Which one is correct?" So without any cause, there cannot be anything. That is logic. And the rascal philosophers' statement, "It happened automatically. There was a chunk, and the creation came. . .," this is rascals' philosophy. Jagad āhur anīśvaram (BG 16.8). The rascals, they do not accept that there is a cause of this creation. That they do not understand. They do not know, and they theorize. You'll find mostly in the Western countries all these philosophers. . . The Darwin's theory. . . He cannot give any reasonable cause. Some theory: "It may be," "Perhaps," "For millions of years there was no. . ." Speculate. And he admits that "Whatever I am presenting, it is all my speculation." You have seen his letter, some, from 150 years ago. He wrote a letter to a friend. He admitted that "Whatever I am presenting, that is speculation." But science is not speculation. Science cannot be speculation. That is not science. "Two plus two equal to four"—this is science. And if you speculate—"Two plus two equal to five" or "Two plus two equal to three"—that is not science.
So the science of Kṛṣṇa is not speculation. It is exactly science. Tad-vijñānam. Tad-vijñānam. Tad-vijñānārtham. Vijñāna means science, not speculation. So one should understand God scientifically. That is required, not imagination. The Māyāvādī philosophers, they say, "You can imagine your God." This is rascaldom. How you can imagine your God? God is God. God means the supreme controller, the Supreme Being. In the dictionary you'll find this word: "God means the Supreme Being." He is also a being like us, individual. Just like we are here, face to face. You are one individual; I am one individual. We are talking or hearing. Similarly, God is also individual.