21821
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Plato's Parmenides has a three-part theory, of Primal One, a One-Many, and a One-and-Many [Plato, by Plotinus]
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Full Idea:
The Platonic Parmenides is more exact [than Parmenides himself]; the distinction is made between the Primal One, a strictly pure Unity, and a secondary One which is a One-Many, and a third which is a One-and-Many.
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From:
report of Plato (Parmenides [c.364 BCE]) by Plotinus - The Enneads 5.1.08
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A reaction:
Plotinus approves of this three-part theory. Parmenides has the problem that the highest Being contains no movement. By placing the One outside Being you can give it powers which an existent thing cannot have. Cf the concept of God.
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16727
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In mixtures, the four elements ceased to exist, replaced by a mixed body with a form [Pasnau]
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Full Idea:
The standard view was that in a mixture there is only the mixed body and its substantial form (gold). There are no further substantial forms of the elements, because the elements do not actually exist within the body.
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From:
Robert Pasnau (Metaphysical Themes 1274-1671 [2011], 22.3)
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A reaction:
This seems to me to be the key idea that was overthrown in the seventeenth century, so that corpuscular matter kept aspects of its ingredients, which science could then investigate. With the substantial form, investigation seemed impossible.
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