Prahlāda Mahārāja says that kaumāra. The boys . . . He was taking the opportunity of teaching his class friend. He was five-years-old boy, and his father was a great demon, Hiraṇyakaśipu: "Don't talk of God." So in this way he was in a very precarious condition. Still, because he was a Vaiṣṇava he was taking the opportunity of preaching Kṛṣṇa consciousness. Preaching Kṛṣṇa consciousness. So he was asking . . . The boys were very eager to play, and he said, "No, no, no, my dear friends, don't play. Let us discuss something about bhāgavata-dharma." Therefore he says that kaumāra ācaret prājñaḥ: "Don't think that in the old age we shall discuss about Kṛṣṇa consciousness. Immediately, in this age," kaumāra, "if you are really intelligent." Why? Is there any guarantee that you become old man? You can die at any moment. So take this opportunity. Until the next death comes you take this opportunity in the matter of Kṛṣṇa consciousness. That is Prahlāda Mahārāja's instruction. "There is no guarantee. Why you are thinking that way, that now you are five years old; you will live for five hundred years? No. There is no guarantee. At any moment you can die."
Durlabhaṁ mānuṣaṁ janma. This body, human form of body, is obtained after many, many millions of years through evolutionary process. Jalajā nava-lakṣāṇi sthāvarā lakṣa-viṁśati (Padma Purāṇa), 8,400,000 species of life we had to come through. Then we have got this body, human form of life, and civilized. Civilized, according to our Vedic conception, a civilized means ārya, ārya. When Arjuna was declining to fight, Kṛṣṇa condemned him, anārya-juṣṭam: "You are just like . . . speaking like an anārya, not an ārya. It is your duty. You must do it." Anārya-juṣṭam akīrtiṁ karam arjuna. "You'll be defied by others. Don't do it." So an ārya . . . Aryan means who accepts this varṇāśrama-dharma, four varṇas, four āśrama. Varnāśramācāravatā puruṣeṇa paraḥ pumān viṣṇur ārādhyate (CC Madhya 8.58). The real aim is to go back to home, back to Godhead, Viṣṇu. So this is the process. If we execute this varṇāśrama-dharma rightly, then we gradually make progress towards spiritual realization. It is so arranged in that way, brāhmaṇa, kṣatriya, vaiśya, śūdra, not by birth but by qualification. Cātur-varṇyaṁ mayā sṛṣṭam (BG 4.13). If these qualifications are found anywhere else, you should accept that.