VII. Inner Processes in the Human Organism. Sense-Perception, Breathing, Sleeping, Waking, Memory
I need not say again today that those ancient practices should not be repeated by modern man with his different constitution, but should be replaced by others which are set forth in the books mentioned. It can however be said with truth in the case of both kinds of knowledge, the knowledge based upon the old, mystical clairvoyance and the knowledge yielded by the exact clairvoyance proper to the modern age, that genuine observation of the processes which take place inwardly in man leads at the same time into the spiritual world.
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