I. Natural Science and Its Boundaries

Above and beyond the ordinary human senses, therefore, we have to distinguish three others: the sense for the sounds of speech, the sense for another person's thoughts, the sense for another person's Ego. It is primarily through these three senses that we establish intercourse with the rest of mankind. They are the means whereby we are introduced into social life among other human beings. But the path connected with the functions of these three senses was followed differently by the ancient sages, especially by the ancient Indian sages, for the purpose of attaining higher knowledge. In this quest for higher knowledge the soul of the sage did not endeavour to understand through the words the meaning of what another person was saying. The forces of his soul were not directed to the thoughts of another person in such a way as to perceive them, nor to the Ego of another in such a way as to perceive and experience this Ego. All such matters were left to everyday life. When after his efforts to attain higher knowledge the sage returned from his sojourn in spiritual worlds to everyday life, he used these three senses in the ordinary way. But when he was endeavouring to cultivate the methods for acquiring higher knowledge, he used them differently. In acts of listening, in acts of perceiving the sounds of speech, he did not allow the soul's force to penetrate through the word in order to understand what the other person was saying, but he remained with the word as such, without seeking for anything behind it. He guided the stream of soul-life only as far as the word itself. His perception of the words was thereby intensified, and he deliberately refrained from attempting to understand anything else through the word. With his whole soul he penetrated into the word as such, using the word or the sequence of words in such a way that this penetration was possible. He formulated certain aphoristic sayings, simple but impressive sentences, and tried to live entirely in the sound, in the tone and ring of the words. With his whole soul he followed the ring of the words which he repeated aloud to himself.