Those who are devas, godly, their lusty desire is controlled, restricted. Therefore this varṇāśrama, four varṇas and four āśramas, this is education how to control this lusty desire. That is required. In the beginning of life, the children, beginning from five years old up to twenty-five years, they are trained up as brahmacārī. Why? Just to control the kāmaṁ duṣpūram. Kāmaṁ duṣpūram. Those who are not in bad association from childhood, if they practice celibacy, they are not disturbed. They are not disturbed. That is called brahmacārī life. Why? To train the child of a human being. Because this human life is meant for stopping the cycle of birth and death. That is the mission. Therefore śāstra says that pitā na sa syāj jananī na sā syāt, na mocayed yaḥ samupeta-mṛtyum (SB 5.5.18). A man should not desire to become a father and the woman should not desire to become a mother unless both of them have taken the vow that "I shall beget a child and stop his cycle of birth and death." This is the duty of the parents. Not that "I shall beget children like cats and dogs." There should be some meaning of the life. Samupeta-mṛtyum.
Because we have got the circumstances, unclean body, because we have got unclean body, therefore there is birth and death. Just like as soon as you are infected, there is fever, similarly, the birth and death is a kind of disease. It is also listed with disease. Janma-mṛtyu-jarā-vyādhi (BG 13.9). They are on the same category: birth, death, old age and disease. They are on the same category. But we take care of two things, namely old age. . . We try to remain young by cosmetic, but that is not possible. Similarly, we want to live forever. The lady doctor was, "Yes, we can extend little more." Then what? After all, you have to die. Extend little more or little less, you cannot avoid death.