Lecture IV
A person who makes a little progress in occult perception can separate the two phases of his soul-activity. He can trace how it is that when he wants to think something or other, he has first not simply to grasp the thought, but to prepare his brain for it. If he has prepared it so that it reflects, then he has the thought. When one wants to investigate occultly, so that one can picture things, one always has, first, the task of carrying through the activity which prepares the picturing. It is this that is so important for us to notice. For it is only when we keep these things well in mind that we have before us the real activity of human thinking. Now for the first time we know how human thinking-activity is carried out. First, this activity lays hold of the brain, in connection somewhere with the central nervous system. It sets in motion—let us say if we wish—the atomistic portions in some way, brings them into some sort of movement; by this means they become a mirror-apparatus; the thought is reflected, and the soul becomes conscious of the thought. Thus we have to distinguish two phases: first the work on the brain from out of the psychic-spiritual in preparation for the external physical experience; then the perception takes place, after the work on the brain has prepared the ground for this act of perceiving by the soul. In the ordinary way this preparatory work on the brain remains entirely unconscious. But an occult researcher must start by actually experiencing it. He has to go through the experience of how the soul-activity is poured in, and the brain made ready to reflect the thought as an image.