Lecture XX

When we breathe out, a damming-up takes place in the blood vessels of the brain, and the cerebral fluid is pushed down through the spinal cord into the abdomen. There is room for it there because breathing out has raised the diaphragm. So thinking and having ideas and so on is not the mere brain process of which the sciences of anatomy and physiology dream today. What takes place in the brain is a mirroring-back by something solid, and this is connected with what is not mirrored but remains in the fluid element whence, via the detour of breathing, it regulates the influence of the aeriform element. This is also the detour via which everything is mediated to us which belongs to a particular climate, the local soil conditions of a particular terrain and all the other influences connected with breathing. That part of breathing which never enters our consciousness but remains lika an ocean swell, is where spiritual realities surge. Via the detour through the cerebral fluid the breathing process is connected with the brain.