One who undertakes to represent certain results of scientific spiritual research of the kind recorded in this book, must above all things be prepared to find that this kind of investigation is at the present time almost universally regarded as impossible. For things are related in the following pages about which those who are today esteemed exact thinkers, assert that they will probably remain altogether indeterminable by human intelligence. One who knows and can respect the reasons which prompt many a serious person to assert this impossibility, would fain make the attempt again and again to show what misunderstandings are really at the bottom of the belief that it is not given to human knowledge to penetrate into the superphysical worlds.

For two things present themselves for consideration. First, no human being will, on deeper reflection, be able in the long run to shut his eyes to the fact that his most important questions as to the meaning and significance of life must remain unanswered, if there be no access to higher worlds. Theoretically we may delude ourselves concerning this fact and so get away from it; the depths of our soul-life, however, will not tolerate such self-delusion. The person who will not listen to what comes from [pg xii] these depths of the soul will naturally reject any account of supersensible worlds. There are however people—and their number is not small—who find it impossible to remain deaf to the demands coming from the depths of the soul. They must always be knocking at the gates which, in the opinion of others, bar the way to what is “incomprehensible.”

Secondly, the statements of “exact thinkers” are on no account to be despised. Where they have to be taken seriously, one who occupies himself with them will thoroughly feel and appreciate this seriousness. The writer of this book would not like to be taken for one who lightly disregards the enormous thought-labour which has been expended in determining the limits of the human intellect. This thought-labour cannot be put aside with a few phrases about “academic wisdom” and the like. In many cases it has its source in true striving after knowledge and in genuine discernment. Indeed, even more than this must be admitted; reasons have been brought forward to show that that knowledge which is to-day regarded as scientific cannot penetrate into supersensible worlds, and these reasons are in a certain sense irrefutable.

Now it may appear strange to many people that the writer of this book admits this freely, and yet undertakes to make statements about supersensible worlds. It seems indeed almost impossible that a person should admit in a certain sense the reasons [pg xiii] why knowledge of superphysical worlds is unattainable, and should yet speak about those worlds.

Yet it is possible to take this attitude, and at the same time to understand that it impresses others as being inconsistent. It is not given to every one to enter into the experiences we pass through when we approach supersensible realms with the human intellect. Then it turns out that intellectual proofs may certainly be irrefutable, and that notwithstanding this, they need not be decisive with regard to reality. Instead of all sorts of theoretical explanations, let us now try to make this comprehensible by a comparison. That comparisons are not in themselves proofs is readily admitted, but this does not prevent their often making intelligible what has to be expressed.

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 [pg xiv] 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 [pg xv] wishes to shut himself off from the spirit of what is expressed in it.

Man's power of cognition may be augmented and made more powerful, just as the eye's power of vision may be augmented. Only the means for strengthening the capacity of cognition are entirely of a spiritual nature; they are inner processes, belonging purely to the soul. They consist of what is described in this book as meditation and concentration (contemplation). Ordinary soul-life is bound up with the bodily instrument; the strengthened soul-life liberates itself from it. There are schools of thought at the present time to which this assertion must appear quite senseless, to which it must seem based only upon self-delusion. Those who think in this way will find it easy, from their point of view, to prove

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