In the Vedas there is recommendation that animals can be sacrificed in yajña. So that is also another meaning. The verse is loke vyavāyāmiṣa-madya-sevā nityā hi jantor na hi tatra codanā. In this material world every living entity has got natural propensity for sex life, meat-eating and intoxication. There is already propensities. You haven't got to teach. Nobody teaches in the school how to enjoy sex life. Everyone knows. So these things are natural. Then why it has been taken by the Vedas? This should be the question, that "Without marriage, sex life is going on. Why this show of marriage?" People may question this. But there is need. Because Vedas have taken this marriage. Marriage is Vedic. So why Vedas have taken this marriage? No, to restrict it. Without marriage, sex life (is) unrestricted. And as soon as it comes to the Vedic principles, it becomes restricted. So the idea is to restrict. People are accustomed to this habit, and on account of this habit, they gradually become implicated with the laws of material nature. Therefore there is some restriction. Just like anyone can distill liquor at home. It is not very difficult thing. Anyone can do it. In India they do it. It is called dheno-mada. Dheno-mada means... Mada means liquor, and dheno means from rice. Just like we cook rice, so you cook rice and keep it in water for a few days or for a month, it becomes liquor. It becomes liquor. So why government has restricted, "No, you cannot manufacture liquor; you have to purchase from the licensed shop." Why? That is restriction. If the government would have allowed that "You can distill liquor and drink it," then there was no limit. Everyone would have. There is no restriction.
So restriction is required. Why? It is because it is bad. Nobody restricts that "You don't manufacture cāpāṭi." No. Because it is not bad thing. There is no such law, that "You don't manufacture nice foodstuff." No. That is very good. But when it is bad, then there is restriction. Therefore there is restriction of sex life, there is restriction of drinking wine, there is restriction of meat-eating, and there is restriction of gambling. Because these things are bad. You cannot become good by indulging in bad things. That is not possible. The same thing. Just like you cannot clear muddy water by putting another mud. That is not possible.
So the human life is meant for purification. Sattva-śuddhi. In the Bhagavad-gītā there is, abhayam... What is that? Can anyone... Abhayaṁ sattva-saṁśuddhiḥ. Sattva-saṁśuddhi, it is very important thing. Sattva means my existence. I am eternal. So I am existing, but I am suffering. I am suffering. Just like I have got now cold affection (infection). This is not my natural state, but I have been affected by chilly cold or something like that. Therefore I am suffering. So it is my duty to cure it, to take some medicine, to go to the physician. That is called sattva-saṁśuddhi, purifying your existence. By nature, by constitutional position, every living entity is as pure as God. But God does not become impure. We become impure. Therefore we are suffering. That is the... So this impurity can be rectified in this life, this human form of life. Therefore human form of life is meant for purification. Therefore so many scriptures are there, so many teachers are there, so many rules and regulations are there. They are not meant for the animals, because they cannot be purified. They must have to come to this position by evolution of human being. Then there is chance of purification.
Therefore in this human life, if we do not purify our existence, then we go on with this impure existence. Impure existence means transmigration of the soul from one body to another, and become subjected to birth, death, old age and disease. This is impurification. So they do not know that "Death is not my obligation. Because I am impure, therefore I am dying. Birth is not my obligation. Because I am impure, therefore I am taking birth." Janma-mṛtyu... Four things: janma-mṛtyu-jarā-vyādhi (BG 13.9). Janma, birth, is due to my impure consciousness. Therefore if we purify our consciousness by advancing, by developing Kṛṣṇa consciousness, then we become pure. This is the process of Kṛṣṇa consciousness movement. Ceto-darpaṇa-mārjanam (CC Antya 20.12), Caitanya Mahāprabhu says, cleansing the heart. And all these purificatory methods, they are based on cleansing the heart. If I think myself that "I am something of this material product..." The scientists, they say that "I am these material things." They do not understand what is spiritual identity. And I do, I act, according to that material conception, that is impurity of my consciousness. First thing is to understand that "I am not this material body."