X. Concerning the Boundary between the Physical World and Supersensible Worlds

If we learn to know the guardian of the threshold we know the state of our soul with regard to the physical world, and whether it is strong enough to banish from physical consciousness the forces and faculties, belonging to supersensible worlds, which should not be allowed to be active in ordinary consciousness. If the supersensible world is entered without the self-knowledge brought about by the guardian of the threshold, we may be overwhelmed by the experiences of that world. These experiences may thrust themselves into physical consciousness as illusive pictures. In that case they assume the character of sense-perceptions, and the necessary consequence is that the soul takes them for realities when they are not so. Rightly developed clairvoyance will never take the pictures of the elemental world for reality in the sense in which physical consciousness has to take the experiences of the physical world as realities. The pictures of the elemental world are only brought into their true association with the realities to which they correspond, by the soul's faculty of transformation.