When he was in the womb of his mother, Prahlada Maharaja listened to the words of Narada Muni. One cannot imagine how the baby in embryo could hear Narada, but this is spiritual life; progress in spiritual life cannot be obstructed by any material condition. This is called ahaituky apratihata. Reception of spiritual knowledge is never checked by any material condition. Thus Prahlada Maharaja, from his very childhood, spoke spiritual knowledge to his class friends, and certainly it was effective, although all of them were children.