19428
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Because something does exist, there must be a drive in possible things towards existence [Leibniz]
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Full Idea:
From the very fact that something exists rather than nothing, we recognise that there is in possible things, that is, in the very possibility or essence, a certain exigent need of existence, and, so to speak, some claim to existence.
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From:
Gottfried Leibniz (On the Ultimate Origination of Things [1697], p.347)
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A reaction:
I love the fact that Leibniz tried to explain why there is something rather than nothing. Bede Rundle and Dale Jacquette are similar heroes. As Leibniz tells us, contradictions have no claim to existence, but non-contradictions do.
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5047
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The world is physically necessary, as its contrary would imply imperfection or moral absurdity [Leibniz]
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Full Idea:
Although the world is not metaphysically necessary, such that its contrary would imply a contradiction or logical absurdity, it is necessary physically, that is, determined in such a way that its contrary would imply imperfection or moral absurdity.
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From:
Gottfried Leibniz (On the Ultimate Origination of Things [1697], p.139)
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A reaction:
How does Leibniz know things like this? The distinction between 'metaphysical' necessity and 'natural' (what he calls 'physical') necessity is a key idea. But natural necessity is controversial. See 'Essentialism'.
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5692
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Introspection is not perception, because there are no extra qualities apart from the mental events themselves [Rosenthal]
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Full Idea:
Introspection cannot be a form of perceiving, since that invariably involves sensory qualities, and no qualities occur in introspection other than those of the sensations and perceptions we introspect; there are no additional qualities.
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From:
David M. Rosenthal (Instrospection [1998])
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A reaction:
This sounds pretty conclusive. Presumably introspection is best described as meta-thought rather than perception, which means that it involves beliefs and judgements, rather than new perceptual qualities. It has to be conceptual, and probably linguistic.
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19429
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The principle of determination in things obtains the greatest effect with the least effort [Leibniz]
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Full Idea:
There is always in things a principle of determination which is based on consideration of maximum and minimum, such that the greatest effect is obtained with the least, so to speak, expenditure.
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From:
Gottfried Leibniz (On the Ultimate Origination of Things [1697], p.347)
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A reaction:
This is obvious in human endeavours. Leibniz applied it to physics, producing a principle that shortest paths are always employed. It has a different formal name in modern physics, I think. He says if you make an unrestricted triangle, it is equilateral.
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