Śrīmad-Bhāgavatam 2.8.7
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Los Angeles, February 10, 19
So here the question is... This question is 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 philosopher's statement, "It happened automatically. There was a chunk, and the creation came...," this is rascal's 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." We 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.