The Prana cannot live alone, or act without a medium; when it is pure Prana, it has the Akasha itself to live in, and when it changes into forces of nature, say gravitation, or centrifugal force, it must have matter. You have never seen force without matter or matter without force; what we call force and matter are simply the gross manifestations of these same things, which, when superfine, are called Prana and Akasha. Prana you can call in English life, the vital force; but you must not restrict it to the life of man; at the same time you must not identify it with Spirit, Atman. So this goes
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