In the same way a photographic plate is first negative; afterwards, when it has undergone a certain process, it becomes positive. And that is the process through which the soul passes in its infancy; it then goes through a certain development. All that it has brought from the higher spheres and from its family becomes developed, becomes positive or solid, in other words it becomes condensed; because that is the time when the spirit is being formed and is becoming positive. If an undesirable impression has fallen upon an infant at that time, no matter what education is given later that first impression remains concrete and solid. Nothing can erase it because infancy is the moment when the soul is becoming positive.