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An Outline of Occult Science by Rudolf Steiner

IV. THE EVOLUTION OF THE WORLD AND MAN

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If the organs of spiritual perception are directed, not to the beginning and end, but to the middle period of evolution of this Saturn incarnation, we find there a condition which consists principally of heat. Nothing is to be found composed of gaseous, fluid, or even solid constituents. All these states appear only in later incarnations. Let us assume that a human being, with the present organs of sense, were to approach the Saturn condition as a spectator. None of the sense-impressions possible to him would confront him there except the feeling of warmth, or heat. Suppose such a being approached this Saturn; he would only sense, upon entering the space occupied by it, that it was in a different degree of heat from the rest of surrounding space. But he would not find that portion of space by any means equally warm throughout, for warmer and colder parts would alternate in the most complicated manner. Radiating heat would be felt along certain lines. And not only straight lines, but regular figures would be formed by the variation in heat. Something like a cosmic being, organically constructed in itself would be discerned, appearing in changing conditions, and consisting only of heat.

It is difficult for a man of the present day to form an idea of anything consisting only of heat, for he is not accustomed to think of heat as something self-existent, but as a perceptible quality of warm or cold gaseous, liquid, or solid bodies. To one who has adopted the physical conceptions of our time it will seem particularly absurd to speak of heat in the foregoing manner. He will, perhaps, say: "There are solid, liquid, and gaseous bodies; but heat only denotes a condition assumed by one of these three bodily forms. If the smallest particles of gas are in motion, the movement will be felt by heat. Where there is no gas, there can be no movement, consequently no heat."

To an occult investigator the fact appears differently. To him heat is something of which he speaks in the same sense as he speaks of gases, of liquids, or of solid bodies. To him it is simply a still finer substance than gas. And gas to him is nothing but condensed heat, in the same sense that liquid is condensed vapour, or a solid body condensed liquid. Thus the occultist speaks of heat bodies just as he does of bodies formed of gas and vapour.

If we are to follow the spiritual investigator into this region, it is however necessary to admit that there is such a thing as psychic perception. In the world, as it presents itself to the physical senses, heat appears entirely as a condition of solid, liquid, or gaseous bodies; but that condition is merely the outward appearance of heat, or the effect of it. Physicists speak only of this effect of heat, not of its inner nature. Just let us try then to leave entirely out of consideration any effect of heat received through external bodies, and to realize merely the inner experience which comes from saying the words: "I feel warm," "I feel cold." That inner experience is the only thing capable of giving an idea of what Saturn was during its period of evolution described above. It would have been possible to pass right through the portion of space it occupied; no gas would have been there to exercise pressure, no solid or liquid body from which light-impressions could have come; but at every point of space occupied, one would have felt inwardly, without any external impression: "Here there is such and such a degree of heat."

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