[245d]
the source and beginning of motion for all other things which have motion. But the beginning is ungenerated. For everything that is generated must be generated from a beginning, but the beginning is not generated from anything; for if the beginning were generated from anything, it would not be generated from a beginning. And since it is ungenerated, it must be also indestructible; for if the beginning were destroyed, it could never be generated from anything nor anything else from it, since all things must be generated from a beginning. Thus that which moves itself must be the beginning of motion. And this can be neither destroyed nor generated,
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