Steiner wrote:I have already explained that the scientific way of thinking was obliged at first to cooperate in producing a certain darkening of the spirit, in support of what the Spirits of Darkness bring into human thinking, ever since 1879. In the scientific sphere this assumes a very subtle aspect. The scientifically trained thinker, or better, the scientific expert who cooperates in the general education of our age and in the formation of a world-conception, cannot help diverting man from casting a glance at the boundary-line between the physical world and the spiritual world, which exists in him. He cannot help this because science is as it is, and he does his very best (excuse this banal expression) to work in this direction by popularizing the scientific methods of thought. A future age will dawn for human thinking (it is terrible that such things are mentioned today – terrible for those who follow a particular line of thought), an age in which certain ideas will be looked upon as comical—ideas now ruling in science, which have not entered the consciousness of the masses, but influence them, because scientists (forgive me) are considered to be authorities.
I have often pointed out the following thought—even publicly in my book Riddles of the Soul: It is a current scientific idea that in the nervous system (we will limit ourselves to man, for the moment, although this can also be applied to animals) we can distinguish sensory, or sense-nerves or perceptive nerves, and motor nerves. It can be drawn schematically, by showing, for instance, that any nerve, say a nerve of touch, carries the sensation of touch to the central organ—let us suppose, to the spinal cord. The sensations from the periphery of the body reach the spinal cord. Then, from another point of the spinal cord goes out the so-called motor nerve. From there, the impulse of the will is in turn transmitted (see drawing).
In the brain this is shown in a more complicated way, as if the nerves were like telegraphic wires. The sense-impression, the impression on the skin, is led as far as the central organ: from there, an order goes out, as it were, that a movement must be carried out. A fly settles somewhere on the body—this causes a sensation; the sensation is led on to the central organ; there, the order is given to lift the hand as far as the forehead to chase away the fly. From a diagrammatic aspect, this is an idea that is generally accepted. A future age will look on this as something extraordinarily comical, for it is comical only for him who can detect this. But it is an idea that is accepted by the majority of professional scientists. Open the nearest book on the elements of science dealing with these things and you will find that today we must distinguish between sensory and motor nerves. You will find that they mention particularly the hilarious picture of the telegraphic wire—that the sensation is conducted to the central organ and that the order is given out from there for the production of a movement. This picture is still very much diffused in popularized science.
However, it is far more difficult to see through reality than through the thoughts that set up comparisons with telegraphic wires, reminding us of the most primitive kinds of ideas. Spiritual Science alone enables us to see through reality. An impulse of the will has nothing in common with physical matter. The nerves exist only to serve a single function, both those nerves we now call sensory nerves and those we call motor nerves. And whether the nerve cord is interrupted in the spinal cord or the brain, both indicate the same thing; in the brain, it is simply interrupted in a more complicated way.
This break is not there so that something from the outside world is transmitted through one half, if I may say so, to the central organ and then, after being transformed into a will by the central organ through the other half, is passed on. This interruption exists for a completely different reason. Our nervous system is interrupted in this regular way because at the very point of the interruption, reflected in an image in man, there lies the boundary line between physical and spiritual experience; it is the bodily reflection of a complicated spiritual reality. This boundary exists in man in a very remarkable way. Man enters into a relationship with the world immediately around him, and this process is connected with that part of the nerve-cord that goes as far as the interruption. But the human being, as a soul being, must also have a relationship with his own physical body. This relationship, which he has with his own physical body, is mediated by the other part. If I move a hand, prompted by an external sensory impression, then the impulse to move this hand, united by the soul with the sensory impression, is already present here, schematically represented (see diagram a). And that which is conducted along the whole sensitive nerves, along the so-called motor nerve, from a to b, is not “conducted as a sense-impression as far as c, where an order is given that gives rise to b”– no, the soul-element is already fructified when an impulse of the will takes place at a, and passes through the entire nerve-path indicated in the diagram.
It is quite out of the question that such infantile ideas should correspond to any form of reality—ideas which presuppose that the soul is to be found somewhere between the sensory and the motor nerves, where it receives an impression from the exterior world and transmits an order from there, like a telegraphic operator. This childish idea, which is met with again and again, is very strange when found in conjunction with the demand that science must at all costs avoid being anthropomorphic! Anthropomorphic lines of thought must be avoided, yet people do not realize how anthropomorphic they themselves are, when they say that an impression is received, an order sent out, etc., etc. They talk and talk and have not the slightest idea what mythological beings they conjure into their dreams about the human organism! They would realize it if they would take things seriously.
Now the question arises: Why then is the nerve-cord interrupted? It is interrupted because, if this were not so, we would not be included in the whole process. Only because the impulse, so to speak, jumps over at the point of interruption—the same impulse, if it is an impulse of will, already emanates from a—are we ourselves within the world, are we part of this impulse. If it were unified,
if there weren't an interruption here, the whole thing would be a natural process, without us being part of it.
Imagine this process in a so-called reflex movement: A fly settles somewhere on your body, you chase away the fly, and the whole process never enters your consciousness fully. The entire process has its analogy, an entirely justified analogy, in the sphere of physics. Inasmuch as this process demands an explanation by means of physics, the explanation will be only a little more complicated than that of another physical process. Take a rubber ball, for instance: you press it here, and deform it. But the ball pops out again and reassumes its former shape. You press in and the ball presses out again. This is the plain physical process, a reflex movement, except that
there is no organ of perception, there is nothing spiritual in the process. But if you interpolate something spiritual here (inner circle) and interrupt it here (center), then the rubber ball feels like an individual being. However, in this case the rubber ball must have a nervous system, so that it can feel both the world and itself. A nervous system always exists in order that we may feel the world in ourselves: it never exists in order to pass on a sensation along one side of the wire, and a motor impulse along the other side.
I am pointing this out because the pursuance of this subject leads us into one of the many points where
natural science must be corrected before it can supply ideas that correspond approximately to the real facts. The ideas ruling today are instruments of the impulses coming from the Spirits of Darkness. The boundary line between physical and spiritual experience lies in man himself.
You see, this piece of nerve that I indicated in red really serves to place us into the physical world, so that we may have sensations in the physical world. The other piece of nerve, indicated in blue, really serves to make us feel ourselves as body. There is no essential difference whether we experience a color consciously from outside, through the nerve-cord <a c>, or whether we experience an organ, or the position of an organ, etc., from inside, through the cord <d b>; in essence, this is the same. In the one case we experience something physical is in us, i.e., enclosed within our skin.
Not only that which is outside, but also what is within us, places us in the process that can be experienced as a will-process. The strength of the perception varies according to the nerve-cords that transmit it—the cord <a c>, or the cord <d b>. Indeed, a definite weakening of the intensity takes place. When an idea is linked up with a will-impulse in a, the impulse is passed on from a; when it jumps from c to d, the whole process weakens to such an extent in our consciousness or experience that we experience its continuation—for instance, the lifting of our hand—only with that slight intensity of consciousness which we possess during sleep. When we lift our hand we are again aware of the will, but in the form of a new sensation from another side. Sleep extends continually in an anatomical and physiological sense into our waking life. We are connected with the exterior physical world, but we are completely awake only with that part of our being that goes as far as the interruption of the nerves. What lies in us beyond this interruption in the nerves is wrapped in sleep, even by day. In the present stage of the evolution of the Earth this process is not yet physical; it takes place on a certain spiritual level, although it is connected to a great extent with the lower qualities of human nature. However, I have often expounded the secret that just man's “lower nature” is connected with the higher manifestations of certain spiritual beings. If we note all the places in the human being where the nerves are interrupted, and jot them down in a diagram, we obtain the boundary-line between the experiencing in the physical world and the experience that comes from a higher world. Hence I can use the following diagram: Suppose that I indicate here all the nerve-interruptions—here is the head and here is a leg. Now suppose that a so-called impression goes out from here and that the interruption of the nerve is in this place. [see p. 17 of the
German .pdf] “Walking” will be the result, and the real process consists in this—that everything that we experience through the nerve here, is experienced by day in a waking way. But what we experience here as unconscious will is experienced in a sleeping way, even when we are awake. The spiritual world forms and creates directly everything that lies below the point of interruption in the nerves.
You may find these things difficult if you hear them for the first time, but they should make you aware that you cannot enter into the more intimate questions of knowledge without some difficulty.
From: Historical Necessity and Freewill - On the Functions of the Nervous System and the Threshold of the Spiritual World -
GA 179 - 1. as retreived from
The Rudolf Steiner Archive.