So that city was full of nondevotee class of men, asuras. There are two classes of men everywhere. Asura and sura. Devatā and asura. In Sanskrit language, those who are devotees, they are called devatā, demigod or godly persons. And those who are nondevotees, they are called demons or asura. These two classes of men are always there in this material world. Mostly they are demonic, atheist, and few of them are devatā. But there are two classes. In the śāstra it is said: dvau bhūta-sargau loke 'smin daiva āsura eva ca (BG 16.6). There are two classes of men-godly and atheist. Viṣṇu bhakta bhaved daiva āsuras tad viparyaya. Those who are devotees of the Supreme Personality of Godhead, all-pervading God, they are called devatā or demigod, and those who are nondevotee, viparyaya, just the opposite number... Viparyaya means the opposite number, nondevotee. They are called asuras.
So Prahlāda Mahārāja, because he was devotee, although he was five years only old, he was taking opportunity of preaching Kṛṣṇa consciousness or God consciousness even during his tiffin hour in the school. So this talking of Prahlāda Mahārāja happened when the teachers in tiffin hour went away. The teachers did not like because Prahlāda Mahārāja's father's strict order was that "This boy is inclined to become a devotee. Please take action that he may not become a devotee." So teachers were afraid. His father was a very powerful king. So teachers also did not allow to talk anything about God. But still, he took the opportunity. When the teachers are gone out of the class and the students are free, he would stand up on his bench and speak about God. So he's speaking; "My dear friends, kaumāra ācaret prājñaḥ." The other boys, they said: "Prahlāda, let us come and play. Why you are talking of God now? When we shall become old, you can talk of God." So Prahlāda Mahārāja said "No, we should learn about God kaumāra." Kaumāra means from five years to ten years. Somebody says up to fifteen years. Anyway, kaumāra ācaret prājñaḥ. Prājñaḥ, if one is intelligent enough, then he should learn about God from the very beginning of life.