Lecture III
When an individual really understands this constitution of the human being—about which many lectures could be given to describe it in full detail—he reaches the point of being able to perceive clearly the distinctions between the head system, and therefore the nerve-sense system, on the one hand, the metabolic-limb system on the other hand, and the mediating system, the rhythmic system, whose essential role is to bring about the balance between the two other systems.
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