What is the distinction between the animal body and the human body? Biologically.... Here is our friend Mr. Ghosh. He knows very well. There is no difference biologically between human body.... Medical students in the biological department, they study from the frogs, from guinea pigs, the human constitution of the body. There is no difference. But what is the difference? Not this bodily construction, but development of consciousness. That is the difference. So if we do not develop.... That is the opportunity, human life. In human life there is the opportunity to develop Kṛṣṇa consciousness.
Therefore śāstra says that nāyaṁ deho deha-bhājāṁ nṛloke: "In the human society the body is not meant for spoiling in sense gratification like the cats, dogs and hogs." Don't create a hog civilization. That is the warning. What is hog civilization? Hog civilization means there is no restriction of eating, up to the stool. The hogs eat up to the stool. So when in the human society there is no restriction or sex life, that is hog society. Because the hogs, they eat up to stool and there is no sex restriction. They do not know whether mother, sister or daughter, they are..., not matter. You will see it. Therefore it is specifically said, nāyaṁ deha, kaṣṭān kāmān arhate viḍ-bhujāṁ ye (SB 5.5.1). The.... Still the hog you will see loitering in the streets whole day and night, "Where is stool? Where is stool? Where is stool? Where is stool? Whole day and night. At night also you'll see. Those who have got experience to pass stool in the villages, you go at dead of night and the hog will immediately come standing. As soon as you leave the place, immediately, "Phas, phas, phas," They will go eat.
So this kind of hard labor simply for satisfying the tongue and the genital, that is hog civilization. That is warned by Ṛṣabhadeva, nāyaṁ deho deha-bhājāṁ nṛloke kaṣṭān kāmān arhate (SB 5.5.1). Why? Kāmān means eating, sleeping, sex life and defending. These are kāmān, bodily necessities of life. As soon as you will get this material body, you will have to eat. In the spiritual body there is no eating. Eating means to sustain this material body. You will find many saintly persons. Practically, they do not eat.