4. Man's Being, His Destiny and World Evolution, Part 1

If, however, we illuminate by the methods of anthroposophical research the regions where the will is pulsating, we discover the following: The intention of carrying out a will-impulse is primarily a thought, a mental image. At the moment when this intention streams down into the organism, something is produced which might be called a process of inner combustion. Invariably, this combustion is kindled in the organism along the entire path followed by the will-impulse. The combustion of metabolic products existing within you brings forth the movement used by the arm in order to carry out a will-impulse. Hence someone who wills an action undergoes, in a physical sense, a burning-up and consuming of his metabolic products. The metabolic products must be renewed for the reason that they are being constantly burned up, consumed by the will-impulse.