The picture thus sketched of a world imperceptible to the senses may seem less incredible if we look with an unprejudiced eye on part of the animal world. What is a fierce, devouring wolf, from a spiritual point of view? What does it reveal to us through that which our senses perceive? Nothing else than a soul that lives in desires, and acts by desire. The external form of the wolf may be called an embodiment of those desires; and if man had no organs with which to perceive that form, if its desires appeared invisibly in their effects,—if, therefore, a force invisible to the eye were prowling about, and might be the cause of all that happened through the visible wolf,—he would still be forced to recognize the existence of a creature corresponding to it. Now the beings of the region of purifying fire are not visible to the physical eye, but to clairvoyant sight only; but their effects are clearly apparent. They bring about the destruction of the ego when it gives them nourishment. These effects are clearly visible if what began as a pleasure leads to excess and debauchery. For even what is perceptible to the senses would attract the ego only in so far as the pleasure had its root in the ego’s own nature. The animal is prompted by desire for that in the outer world which its three bodies crave. Man has higher enjoyments, because to the three principles of his bodily nature is added the fourth, the ego. But if the ego seeks a gratification which does not tend toward the maintenance and development of its nature but to its destruction, then such a craving can be neither the effect of its three bodies, nor that of its own nature, but can only be caused by beings, concealed from the senses in their true form, but able furtively to approach that higher nature of the ego, and excite in it desires which, though it is cut off from the senses, can still be satisfied only by means of sense-organs. For there are beings which feed on passions and desires of a worse kind than those of an animal nature, because they do not expend themselves on objects of the senses but seize upon the spiritual element and drag it down to a sensual level. Therefore the forms of such beings are more hideous, more horrible, to spiritual sight than are the forms of the fiercest animals, in which after all only passions rooted in the senses are incarnated. And the destructive forces of these beings immeasurably surpass any destructive rage existing in the animal world as perceived by the senses. Occult science must in this way enlarge man’s view so as to include a world of beings standing, in a certain respect, lower than the visibly destructive animal world.