The arbitrary and often nonsensical element in dream-pictures arises from the fact that the astral body cannot, on account of its separation from the sense-organs of the physical body, relate its pictures to the correct objects and events of the outer environment. It is especially illuminating, in this matter, to examine a dream in which the ego is, as it were, split up; as, for example in the case of a person who dreams that he is a schoolboy and cannot answer the propounded question, while immediately afterward as the teacher, he himself answers it. The dreamer, being unable to make use of his physical organs of perception, is not able to connect both occurrences with himself, as the same individual. Therefore, in order to recognize himself also as a permanent ego, man must first be equipped with outer organs of perception. Only when he has acquired the faculty of self-consciousness without the aid of such organs will the permanent ego also become perceptible to him outside his physical body. Clairvoyant consciousness has to acquire this faculty, and the method of doing so will be treated in detail later in this work. Even death takes place for no other cause than a change in the connection of the principles of man’s being. And what is visible to clairvoyant observation with regard to death may also be seen in its effects in the manifested world; in this case also, an unbiased judgment will find the teachings of occult science confirmed by observing external life. The expression of the invisible in the visible is, however, less evident with regard to these facts, and there is greater difficulty in feeling the full importance of that which in the events of outer life endorses the statements of occult science in this domain. These statements may be supposed to be mere pictures of fancy, even more readily than many other things that have been dealt with in this work, if we shut ourselves off from the knowledge that everywhere in the visible is contained an unmistakable foreshadowing of the invisible.