Do not consider yourselves as mere boys and therefore ignorant of it for the spirit embodied in your bodies is eternal. Birth, youth and decay are the properties of the body not of the soul. I am now a child—when I shall be young I shall exert myself for my behoof; I am yet a youth and when I shall grow old I shall work for the benefit of my soul. I am old now—all my senses have failed me and I cannot exert myself. What shall I do now, vicious-minded as I am? I did not do anything when I was capable of doing it.

In plain words: Prahlada tells the boys not to think they are too young for this, because the soul inside them never dies. Only the body is young or old. He describes how people keep putting off spiritual effort: a child waits for youth, a young person waits for old age. Then in old age their senses fail, and they regret doing nothing when they could.