Those who are determined that "In this life we shall finish this material way of life, or material . . ." That is real struggle for existence. Actually, everyone is trying. Material life means it is full of distress, duḥkhālayam. Kṛṣṇa says. So, so long you'll prolong this material way of life, that is called struggle for existence. The "struggle for existence" and "survival of the fittest," this word is very common, but nobody knows what is that struggle for existence and what is the platform of becoming fittest. Nobody knows. It is we are preaching that "If you remain in this material world, then struggle for existence will continue." And fittest means one who has come to the spiritual platform, he is fittest to survive. What is survival? Who is going to survive? Do you mean to say by cultivating health culture, very strong, you'll survive? Nobody will survive. So who will survive? Only Kṛṣṇa conscious. If he is strictly Kṛṣṇa conscious, then he will survive. Tyaktvā dehaṁ punar janma naiti mām eti (BG 4.9). The Kṛṣṇa conscious person who has studied Kṛṣṇa only, nothing more, perfectly, then he is fit. This body also, this body is not permanent. That's a fact. But tyaktvā deham, after giving up this body, no more material body; spiritual body, sac-cid-ānanda-vigrahaḥ (BS 5.1).
So we should be very serious. We should not fall down from the standard of Vedic culture. If you are actually serious about stopping this . . . manaḥ-ṣaṣṭhānīndriyāṇi prakṛti-sthāni karṣati (BG 15.7). This is struggle for existence. In this material world everyone is struggling to survive. But who is surviving? That way, materialistic way of life, will not help you to survive. That is . . . prakṛteḥ kriyamāṇāni (BG 3.27). Nature is so strong that you must die. "I am very strong." You may be very strong, that's all right, but you must. There is a, I mean to say, joking story that one man thought, "How to avoid death?" Just like Hiraṇyakaśipu. So he thought that "Yamarāja is the superintendent of death. He comes to take, so I shall make such policy that he may not come to me." What is that policy? "So bring some stool. I shall smear over my body, and out of bad smell, he'll not come." (laughter) So he began to smear stool on his body at the time of death. (laughter) So this is going on. They are making body very stout and strong so they'll survive. Nobody will survive, sir, unless he is Kṛṣṇa conscious.