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Translated by Stephen MacKenna and B. S. Page.
» Contents of this Ennead
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22. But suppose that we identify alteration with Motion on the ground that Motion itself results in difference: how then do we proceed to define Motion?
It may roughly be characterized as the passage from the potentiality to its realization. That is potential which can either pass into a Form — for example, the potential statue — or else pass into actuality — such as the ability to walk: whenever progress is made towards the statue, this progress is Motion; and when the ability to walk is actualized in walking, this walking is itself Motion: dancing is, similarly, the motion produced by the potential dancer taking his steps.
In the one type of Motion a new Form comes into existence created by the motion; the other constitutes, as it were, the pure Form of the potentiality, and leaves nothing behind it when once the motion has ceased. Accordingly, the view would not be unreasonable which, taking some Forms to be active, others inactive, regarded Motion as a dynamic Form in opposition to the other Forms which are static, and further as the cause of whatever new Form ensues upon it. To proceed to identify this bodily motion with life would however be unwarrantable; it must be considered as identical only in name with the motions of Intellect and Soul.
That Motion is a genus we may be all the more confident in virtue of the difficulty — the impossibility even — of confining it within a definition.
But how can it be a Form in cases where the motion leads to deterioration, or is purely passive? Motion, we may suggest, is like the heat of the sun causing some things to grow and withering others. In so far as Motion is a common property, it is identical in both conditions; its apparent difference is due to the objects moved.
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