Amazon.com description: Product Description: An Outline of Occult Science - Occult Classics Human understanding, as it works in everyday life and in ordinary science, is actually so constituted that it cannot penetrate into superphysical worlds. This may be proven beyond the possibility of denial. But this proof can have no more value for a certain kind of soul-life than the proof one would use in showing that man's natural eye cannot, with its visual faculty, penetrate to the smallest cells of a living being, or to the constitution of far-off celestial bodies. Just as the assertion is true and demonstrable that the ordinary power of seeing does not penetrate as far as the cells, so also is the other assertion which maintains that ordinary knowledge cannot penetrate into supersensible worlds. And yet the proof that the ordinary power of vision has to stop short of the cells in no way excludes the investigation of cells. Why should the proof that the ordinary power of cognition has to stop short of supersensible worlds, decide anything against the possibility of investigating those worlds? One can well sense the feeling which this comparison may evoke in many people. One can even understand that he who doubts and holds the above comparison against this labor of thought, does not even faintly sense the whole seriousness of that mental effort. And yet the present writer is not only fully convinced of that seriousness, but is of opinion that that work of thought may be numbered among the noblest achievements of humanity. To show that the human power of vision cannot perceive the cellular structure without the help of instruments, would surely be a useless undertaking; but in exact thinking, to become conscious of the nature of that thought is a necessary work of the mind. It is only natural that one who devotes himself to such work, should not notice that reality may refute him. The preface to this book can be no place for entering into many "refutations" of former editions, put forth by those who are entirely devoid of appreciation of that for which it strives, or who direct their unfounded attacks against the personality of the author; but it must, none the less, be emphasized that belittling of serious scientific thought in this book can only be imputed to the author by one who wishes to shut himself off from the spirit of what is expressed in it.