Lecture X

All this is already prepared in the metabolic system. But the metabolism as a human system is so placed into the whole cosmos that it could not exist for itself alone. Isolated in itself the digestive system could not exist. This is why it was the third system to have its rudiments implanted in man. The rudiments of the system of nerves and senses took form in the epoch of old Saturn; the second system, the rhythmic system, was laid down during the epoch of old Sun. Only after these other systems had come into being could the metabolic system be produced, because in and for itself this system could not exist. The metabolic system, if at first we omit its involuntary movements, is intended, in its cosmic connection, to provide for human nutrition. But these processes of nutrition cannot function independently. Digestion is necessary to man, but in and for itself it cannot exist. For if we study the human metabolic system in isolation—in the forthcoming lectures you will again see how necessary it is for the whole human organism—we find it constantly imbued with every kind of tendency towards illness. And the origin of internal illnesses—not those caused by external injury—must always be looked for in the metabolic system. Anyone, therefore, who wishes to put forward a rational observation of illness must start with the metabolic system; and in regard to every metabolic phenomenon he must really ask: Now where did you come from? When we consider all the phenomena, from the taking of food into the mouth, from the way the food is worked upon so that we transform certain substances into starch, sugar and so on, when we take the enveloping action of ptyalin in the mouth, when we go further and take the pepsin process in the stomach, and the assimilation of the products in digestion, following all these as far as their passage into the lymphatic vessels and into the blood—then we realize that each single one of these processes must be investigated—and their number is legion. The mingling of the products of digestion with the secretions of the pancreatic glands, the further mingling of these substances with the secretions from the gall-bladder, and so on—to each single process the question must be put: What is it that you really want? And it will answer: If I am alone I am a process which always makes man ill. No digestive process in human nature may be carried to its conclusion, for every digestive process which is carried to its conclusion makes man ill. The human constitution is only healthy when the metabolic processes are checked at a certain stage.