2. Human Duality

Let us begin by considering the upper portions of the human organism. It is these that receive the sense-impressions through the organs of sense, and work over the material contained in our sense-perceptions. We may say, therefore, that what takes place in the human head, in the upper part of the organism, is a working over of those impressions which flow in from outside through the sense-organs; and that what we may describe as the cause of everything that takes place in these upper parts is to be found in its essence in the external impressions or imprints. And, since these external impressions send their influences, together with what results from these influences in the working over of the outer impressions, into the upper organs of the organism, they therefore change the blood, or contribute to its change, and in their own way send this blood back to the heart transformed, just as the blood is sent back to the heart transformed from the rest of the organism.