And the boy, wondering greatly and in deep sorrow, said, "Let me stay with you now." But his sister said, "That cannot be." Then she said, "I will give you a Shadow, which you must keep with you as your guardian spirit. And while you have it with you, no harm can come to you, for it will be present only in the Light, and where there is Light there can be no wickedness. But when it disappears you must be on your guard against doing evil, for then there will be darkness, and darkness may lead you to wrong."