The Vedic system of civilization is seventy-five percent life of celibacy. In the brahmacārī system there is no connection with woman. Student life. Student life, if one remains brahmacārī, he becomes determined. His brain becomes very receptive. Therefore in the brahmacārī system, complete celibacy, no connection with woman. So up to twenty-five years, if he does not discharge semen, he becomes very stout, strong, and his health is built up for whole life, and he becomes so intelligent that anything he will hear, he will remember immediately.
Then after brahmacārī system, if one cannot remain brahmacārī, naiṣṭhika-brahmacārī, then the spiritual master allows him to marry. That is gṛhastha-āśrama. So when one is complete, fit for sex life, he begets children, male children, and after twenty-five years the child becomes grown up, so he retires. In this way, brahmacārī, gṛhastha, vānaprastha and sannyāsa. The whole aim is Viṣṇu, how to go back to home, back to Godhead. Not like . . . living like this, animals. Śva-viḍ-varāhoṣṭra-khara. Not to live. That is not human life.
Śva means dependent. "Unless somebody gives me food, I cannot live." That is the life of a dog. A street dog is never happy. One dog who has got master, he is happy. That is śva. Viḍ-varāha means eating everything, anything nonsense eatable. Varāha, viḍ-varāha. Śva-viḍ-varāha-uṣṭra. Uṣṭra means chewing or drinking his own blood, and he thinks it is very tasteful. And similarly ass. Ass is working hard for the washerman, not for himself, and still, he thinks he is happy.