This material world is certified by the Supreme Lord, the creator, as duḥkhālayam. Duḥkhālayam means "the place of miseries." And how you can make it comfortable? Can you make it comfortable by your so-called advancement of science? No. It is not possible. But we do not know what is duḥkha, or what is suffering. Real duḥkha is, real suffering is, birth and death, old age and disease. But we have set aside. Because we cannot make solution of these things, we don't care for it. We are after Sputnik and atomic bomb. That is our scientific advancement. Why don't you solve these important things, which is giving me always suffering? They have no power.
So here is the solution, that Kṛṣṇa says, mām upetya punar janma (BG 8.15): "If anyone attains into My platform, then he does not come back again," punar janma, "rebirth again." Where? Duḥkhālayam aśāśvatam: "This place, full of miseries, full of . . ." Just try to understand that this place is full of miseries. There . . . in the modes of ignorance we cannot understand. Just like the cats and dogs and hogs, they cannot understand that what miserable condition of life they are pulling on, similarly, human . . . a human being is called rational animal. They are animal, but at the same time, they have got the rationality. But that rationality is being used in the purpose of animal propensities. That rationality is not being used how to get liberated from this miserable condition. That is a misuse of rationality.