[245e]
otherwise all the heavens and all generation must fall in ruin and stop and never again have any source of motion or origin. But since that which is moved by itself has been seen to be immortal, one who says that this self-motion is the essence and the very idea of the soul, will not be disgraced. For every body which derives motion from without is soulless, but that which has its motion within itself has a soul, since that is the nature of the soul; but if this is true,—
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