Śrīmad-Bhāgavatam 3.25.10
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Bombay, November 10, 1974
And people are doing that. They do not offer to Kṛṣṇa, and they eat whatever they like. The result is that you have misused this opportunity of human life, to understand Kṛṣṇa and go back to home, back to Godhead, so that you'll be happy eternally. You'll be freed from this entanglement of bhūtvā bhūtvā pralīyate [Bg. 8.19]. You enjoy one duration of life; again you have to give it up. Then you accept another duration of life. Bhūtvā bhūtvā pralīyate. This human life is meant for getting rid of this business, taking birth and dying, taking birth and dying. This is meant. This is... This opportunity's given, but if you do not use it properly, you use it as cats and dogs and hogs, then the..., by nature's law, you will get the body next life cats and dogs and hogs. You eat even stool. Because you had no discrimination in eating, the "All right, you can now eat..." the pig's body, hog's body you get, and eat even up to stool. That opportunity is given. And you have sex life with your mother and sister. You see hog's life. They have no sex discrimination. They do not discriminate, "It is..., she is my mother," or "She is my sister." No. So this is hog's life. Therefore śāstra says that "Don't be foolish to lead a life like hogs." Nāyaṁ deho deha-bhājāṁ nṛloke kaṣṭān kāmān arhate viḍ-bhujāṁ ye [SB 5.5.1]. The material civilization should not be like that. What is that? Now, simply for sense gratification. Nāyaṁ deho deha-bhājāṁ nṛloke kaṣṭān kāmān. That sense gratification is also not very easy. People are working so hard. They are stealing even, risking life. So many things they are... This is not very easygoing life. Kaṣṭān kāmān. Everything is studied by śāstra. Arhate viḍ-bhujāṁ ye. This kind of life is meant for the hogs.
So human life is not meant for like that. Human life is meant for tapasya. Tapo divyaṁ putrakā yena śuddhyet sattvam, śuddhyet [SB 5.5.1]. You have to purify your existence. Now our existence is not purified. We get this contaminated body and change it; again another contaminated body, another... Just like one man is suffering from disease: one contamination, then another contamination, another... This is not life. You purify yourself. And that purification begins when you accept the life of austerities, tapaḥ, tapasya. Tapasya means voluntarily accepting some... This is not inconvenience. Just like in our society it is enjoined, the students, they should voluntarily accept the principle: no illicit sex life, no meat-eating, no fish-eating, no, nothing of the sort, no intoxication, and no gambling. This is tapasya. Especially for these European and American students, they are, from the beginning of their life, they are accustomed to these habits. But they have voluntarily given up on my word. And that is guru's business. So to purify so that he may be saved from this illusion—he must be purified—so this little inconvenience for higher happiness, that is desired, that is required.