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Str. There are all the animals, and all the plants that grow out of the earth from seeds and roots, and all the lifeless substances, fusible and infusible, that are formed within the earth. Shall we say that they came into being, not having been before, in any other way than through God’s workmanship? Or, accepting the commonly expressed belief—
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Theaet. What belief?
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Str. That nature brings them forth from some self-acting cause, without creative intelligence. Or shall we say that they are created by reason and by divine knowledge that comes from God?
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Theaet. I, perhaps because I am young, often change from one opinion to the other; but now, looking at you and considering that you think they are created by God, I also adopt that view.
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Str. Well said, Theaetetus; and if I thought you were one of those who would think differently by and by, I should try now, by argument and urgent persuasion, to make you agree with my opinion; but since I understand your nature and see that it of itself inclines, without any words of mine, towards that to which you say you are at present attracted, I will let that go; for it would be a waste of time. But I will assume that things which people call natural are made by divine art, and things put together by man out of those as materials are made by human art, and that there are accordingly two kinds of art, the one human and the other divine.
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Theaet. Quite right.
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Str. Now that there are two, divide each of them again.
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Theaet. How?
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Str. You divided all productive art widthwise, as it were, before; now divide it lengthwise.
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Theaet. Assume that it is done.
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Str. In that way we now get four parts in all; two belong to us and are human, and two belong to the gods and are divine.
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Theaet. Yes.
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Str. And again, when the section is made the other way, one part of each half has to do with the making of real things, and the two remaining parts may very well be called image-making; and so productive art is again divided into two parts.