Lecture I
The senses in this group here (see diagram) can be clearly distinguished one from another, and at the same time we can discover what they have in common when we perceive through them. It is our cognitive intercourse with the external world that this group of senses conveys to us in very varying ways. First, we have four senses which unite us with the outer world beyond any doubt. They are the ego-sense, the sense of thought, the word-sense and the sense of hearing. You will unhesitatingly recognise that when we perceive the ego of another person, we are with our entire experience in the outer world, as also when we perceive the thoughts or words of another. As regards the sense of hearing it is not quite so obvious; but that is only because people have taken an abstract view of the matter, and have diffused over the whole of the senses the colouring of a common concept, a concept of what sense-life is supposed to be, and do not consider what is specific in each individual sense. Of course, one cannot apply external experiment to one's ideas upon these matters, but one has to be capable of an inner feeling for these experiences.