Lecture XVIII

This same counteraction, however, goes on, interiorised and centralised, in the human organism itself. By virtue of its lungs the human organism is a genuine earth in miniature, and all the pulmonary processes work downwards in the same manner as the forces of earth work upwards into the plant, passing from the earth to the plant's organisation. All that comes to meet the inner metabolism of the lungs, from the breathing and heart activity, has the same method of operation as the external cosmic forces.