The purpose of this book is to give a description of some of the regions of the supersensible world. The reader who is only willing to admit the existence of the sensible world will look upon this description as merely an unreal production of the imagination. Whoever looks for paths that lead beyond this world of the senses, however, will soon learn to understand that human life only gains in worth and significance through insight into another world. He will not, as many fear, be estranged from the real world through this new power of vision because only through it does he learn to stand securely and firmly in this life and learns to know the causes of life. Without this power of vision he gropes like a blind man through their effects. Only through the understanding of the supersensible does the sensible real acquire meaning. A man therefore becomes more and not less fit for life through this understanding. Only he who understands life can become a truly practical man.The author of this book describes nothing to which he cannot bear witness from experience the kind of experience that belongs to these regions. Nothing will be described here that has not been personally experienced in this sense. This book cannot be read in the customary manner of the present day. In certain respects every page, and even many sentences, will have to be worked out by the reader. This has been aimed at intentionally because only in this way can the book become to the reader what it ought to be. The one who merely reads it through will not have read it at all. Its truths must be experienced, lived. Only in this sense has spiritual science any value. The book cannot be judged from the standpoint of science if the point of view adopted in forming such a judgment is not gained from the book itself. If the critic will adopt this point of view, he will certainly see that the presentation of the facts given in this book will in no way conflict with truly scientific methods. The author is satisfied that he has taken care not to come into conflict with his own scientific scrupulousness even by a single word. Those who feel more drawn to another method of searching after the truths here set forth will find such a method in my Philosophy of Freedom. The lines of thought taken in these two books, though different, lead to the same goal. For the understanding of the one, the other is by no means necessary, although undoubtedly helpful to some persons. Those who look for ultimate truths in this book will perhaps lay it aside unsatisfied. The primary intention of the author has been to present the fundamental truths underlying the whole domain of spiritual science. It lies in the very nature of man to ask at once about the beginning and the end of the world, the purpose of existence, and the nature and being of God. Anyone, however, who looks not for mere phrases and concepts of the intellect, but for a real understanding of life, knows that in a work that deals with the elements of spiritual knowledge, things may not be said that belong to the higher stages of wisdom. It is indeed only through an understanding of these elements that it becomes clear how higher questions should be asked. In another work forming a continuation of this one, namely in the author's Occult Science, an Outline, further particulars will be found on the subject here dealt with. In the preface to a second edition of this book the following supplementary remarks were inserted: Anyone who at the present time gives a description of supersensible facts ought to be quite clear on two points. The first is that the cultivation of supersensible knowledge is a necessity for our age; the other is that the intellectual and spiritual life of the day is full of ideas and feelings that make a description like this appear to many as an absolute chaos of fantastic notions and dreams. Knowledge of the supersensible is a necessity today because all that a man can learn through current methods about the world and life arouses in him numerous questions. Those can be answered only by means of supersensible truths. We ought not to deceive ourselves with regard to the fact that the teaching concerning the fundamental truths of existence given within the intellectual and spiritual currents of today is for the deeply feeling soul a source, not of answer, but of questions about the great problems of the universe and of life. Some people may for a time hold firmly to the opinion that they can find a solution of the problems of existence within conclusions from strictly scientific facts, and within the deductions of this or that thinker of the day. But when the soul descends into those depths into which it must descend if it is to understand itself, what at first seemed to be an answer appears only as the incentive to the real question. An answer to this question does not merely have to satisfy human curiosity. On it depend the inner calm and completeness of the soul life. The attainment of such an answer does not satisfy merely the thirst for knowledge. It makes a man capable of practical work and fits him for the duties of life, while the lack of an answer to these questions lames his soul and finally his body also. In fact, the knowledge of the supersensible is not merely something that meets a theoretical requirement. It supplies a method for leading a truly practical life. It is just because of the nature of our present day intellectual life that study in the domain of spiritual knowledge is indispensable. On the other hand it is an evident fact that many today reject most strongly what they most sorely need. Some people are so greatly influenced by theories built up on the basis of exact scientific experience that they cannot do otherwise than regard the contents of a book like this as a boundless absurdity. The exponent of supersensible truths is able to view such a fact entirely free from any illusions. People will certainly be prone to demand that he give irrefutable proofs for what he states, but they do not realize that in so doing they are the victims of a misconception. They demand, although unconsciously, not the proofs lying within the things themselves, but those that they personally are willing to recognize or are in a condition to recognize. The author of this book is sure that any person, taking his stand on the basis of the science of the present day, will find that it contains nothing that he will be unable to accept. He knows that all the requirements of modern science can be complied with, and for this very reason the method adopted here of presenting the facts of the supersensible world supplies its own justification. In fact, the way in which true modern science approaches and deals with a subject is precisely the one that is in full harmony with this presentation. Anyone who thinks thus will feel moved by many a discussion in a way described by Goethe's deeply true saying, A false teaching does not offer any opening to refutation because it rests upon the conviction that the false is true. Argument is fruitless with those who allow only such proofs to weigh with them as fit in with their own way of thinking. Those who know the true nature of what is called proving a matter see clearly that the human soul finds truth through other means than by argument. It is with these thoughts in mind that the author offers this book for publication.