I. Natural Science and Its Boundaries

Three faculties come into the picture here. Three faculties bring us into the right connection and regulate our intercourse with the outer world of men: speech, the capacity to understand the thoughts of our fellow-man, and perception of the Ego of another person. In speaking of these three faculties: perception of the sounds of speech, perception of thoughts, perception of the Ego of another human being, we are expressing something that appears to be simple but is by no means found so by earnest and conscientious seekers for knowledge.