The world as a whole is not prepared or ready to use spiritual powers. The sages and mystics will ask: "will he do real justice to the power if he had it?" This explains why they select a few awakened souls, and leave the children to go on playing. They think it is a sin to take little children away from their play when they wish to go on playing - why make them grave, serious, anxious, sorrowful? Surely, it is better just now to give them more toys - the occupations they are so engrossed in, the sports they so much love.