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A History of Greek Philosophy /
PLATO
Page 26
That which Plato here calls ‘What Is’ he elsewhere calls ‘The Limiting or Defining’; the ‘Other’ he calls ‘The Unlimited or Undefined.’ Each has a function in the divine process. The thoughts of God attain realisation in the world of things which change and pass, through the infusion of themselves in, or the superimposing of themselves upon, that which is Nothing apart from them,—the mere negation of what is, and yet necessary as the ‘Other’ or correlative of what is. Thus we get, in fact, four forms of existence: there is the Idea or Limiting (apart); there is the Negative or Unlimited (apart), there is the Union of the two (represented in language by subject and predicate), which as a whole is this frame of things as we know it; and fourthly, there is the Cause of the Union, which is God. And God is cause not only as the beginning of all things, but also as the measure and law of their perfection, and the end towards which they go. He is the Good, and the cause of Good, and the consummation and realisation of Good.
This absolute Being, this perfect Good, we cannot see, blinded as we are, like men that have been dwelling in a cave, by excess of light. We must, therefore, look on Him indirectly, as on an image of Him, in our own souls and in the world, in so far as in either we discern, by reason, that which is rational and good.
Thus God is not only the cause and the end of all good, He is also the cause and the end of all knowledge. Even as the sun is not only the most glorious of all visible objects, but is also the cause of the life and beauty of all other things, and the provider of the light whereby we see them, so also is it for the eye of the soul. God is its light, God is the most glorious object of its contemplation, God we behold imaged forth in all the objects which the soul by reason contemplates.
Cf. Plato Complete Works, Plato Home Page & Anthology, Guthrie : Life of Plato and philosophical influences, Research a KeyWord in Plato's Works
Reference address : https://www.ellopos.net/elpenor/greek-texts/ancient-greece/history-of-philosophy/plato.asp?pg=26