But not only to such has the investigator of the higher truth to speak. He must address his words to all mankind. For he has to make known things that concern all humanity. Indeed he knows that without a knowledge of these things no one can, in the true sense of the word, be a "human being." And he speaks to all mankind because he knows that there are different grades of understanding for what he has to say. He knows that even those who are still far from the moment in which they will themselves be capable of spiritual investigation can bring a certain measure of understanding to meet him. For the Afeeling for truth and the power of understanding it is inherent in every human being. And to this understanding, which can flash forth in every healthy soul, he in the first place addresses himself. He also knows that in this understanding there is a force which, little by little, must lead to the higher grades of knowledge. This feeling, which perhaps at first sees nothing at all of that which is told it, is itself the magician which opens the "eye of the spirit." In darkness this feeling stirs; the soul does not see, but through this feeling it is seized by the power of the truth; and then the truth will gradually draw nearer to the soul and open in it the "higher sense." For one person it may take a longer, for another a shorter time, but everyone who has patience and endurance reaches this goal. For although not every physical eye can be operated on, every spiritual eye can be opened, and when it will be opened is only a question of time.
Erudition and scientific training are not essential to the unfolding of this "higher sense." It can be developed in the simpleminded person just as in the scientist of high standing. Indeed, what is often called at the present time "the only true science" can, for the attainment of this goal, be a hindrance rather than a help. For this science too often permits to be considered "real" only what is perceptible to the ordinary senses. And however great its merit is in regard to the knowledge of that reality, it creates at the same time a mass of prejudices which close the approach to higher realities.
In objection to what is said here it is often brought forward that "insurmountable limits" have been once and forever set to human knowledge, and that, since one cannot pass beyond these limits, all branches of investigation and knowledge which do not take them into account must be rejected. And a person who wishes to make assertions about things which many regard as proved to lie beyond the limits that have been set to human capacities of knowledge, is looked upon as highly presumptuous. Those who make such objections entirely disregard the fact that a development of the human powers of knowledge has to precede the higher knowledge. What lies beyond the limits of knowledge before such a development is, after the awakening of faculties slumbering in each human being, entirely within the realm of knowledge. One point in this connection must, indeed, not be neglected. One could say, "Of what use is it to speak to people about things for which their powers of knowledge are not yet awakened, and which are therefore still closed to them?" But that is also the wrong way to look at it. One requires certain faculties to find out the things referred to; but if, after having been found out, they are made known, every person can understand who is willing to bring to bear upon them unprejudiced logic and a healthy instinct for truth. In this book the things made known are of no other kind than such as can produce the impression that through them the riddle of human life and the phenomena of the world find a satisfying explanation. This it can do on anyone who allows thinking that looks at all sides of a subject and is unclouded by prejudice, and a feeling for truth that is free, and sets no reserves, to take effect. Let one merely place himself in the attitude of asking, "If the things that are asserted here are true, do they afford a satisfying explanation of life?" and one will find that the life of each human being supplies the confirmation.
In order to be a "teacher" in these higher regions of existence, it is by no means sufficient that a person has developed the sense for them. For that purpose "science" is necessary, just as much as it is necessary for the teacher's calling in the region of ordinary reality. "Higher seeing" alone makes a "knower" in the spiritual just as little as healthy sense organs make a "scholar" in regard to the sensible realities. And because in truth all reality, the lower and the higher spiritual, are only two sides of one and the same fundamental essence, anyone who is unlearned in the lower branches of knowledge will as a rule remain so in regard to the higher. This fact creates a feeling of responsibility that is immeasurable in him who, by a spiritual call, is destined to be a teacher in the spiritual regions of existence. It creates in him humility and reservedness. But it should deter no one from occupying himself with the higher truths, not even him whose other circumstances of life afford no opportunity for the study of ordinary science.