An Outline of Occult Science

Rudolf Steiner
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From the intro: "My knowledge of things of the spirit is a direct result of my own perception, and I am fully conscious of this fact. In all details I had always examined myself carefully as to whether every step I took in the progress of my perception was accompanied by a fully awake consciousness. Just as the mathematician advances from thought to thought without the unconscious or autosuggestion playing a role, so — I told myself — spiritual perception must advance from objective imagination to objective imagination without anything living in the soul but the spiritual content of clear, discerning consciousness. The knowledge that an imagination is not a mere subjective picture, but a representation in picture form of an objective spiritual content is attained by means of healthy inner experience. This is achieved in a psycho-spiritual way, just as in the realm of sense-perception one is able with a healthy organism to distinguish properly between mere imaginings and objective perceptions. Thus the results of my perception stood before me.”