Anyone attempting an exposition of the results of spiritual science as recorded in this book must, above all, take into account the fact that at present these results are universally looked upon as something quite impossible. For things are said in the following exposition that the supposedly exact thinking of our age affirms to be “probably entirely indeterminable by human intelligence.” He who knows and appreciates the reasons why so many earnest persons are lead to maintain this impossibility will wish to make ever new attempts to show the misconceptions upon which is based the belief that entrance into supersensible worlds is denied to human knowledge. […] Any human soul, by reflecting deeply, will in the long run be unable to disregard the fact that its most important questions concerning the meaning and significance of life must remain unanswered if there be no access to supersensible worlds. We may theoretically deceive ourselves about this fact, but the depths of the soul-life will not tolerate this self-delusion. — If we do not wish to listen to these depths of the soul, we shall naturally reject any statement about supersensible worlds. Yet there are human beings — really not few in number — who find it impossible to remain deaf to the demands coming from these soul depths. Such people must always knock at the door that conceals, according to the opinion of others, the “inconceivable.”
Source: Rudolf Steiner – GA 13 – An Outline of Occult Science: Preface fourth edition
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