16975
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Essences are used to explain natural kinds, modality, and causal powers [Tahko]
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Full Idea:
Essences are supposed to do a lot of explanatory work: natural kinds can be identified in terms of their essences, metaphysical modality can be reduced to essence, the causal power of objects can be explained with the help of essence.
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From:
Tuomas E. Tahko (The Epistemology of Essence (draft) [2013], 1)
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A reaction:
Natural kinds and modality are OK with me, but I'm dubious about the third one. If an essence explains something's causal powers, I have no idea what an essence might be. Essence are largely characterised in terms of causal powers.
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23609
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I act justly if I follow my Prince in an apparently unjust war, and refusing to fight would be injustice [Hobbes]
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Full Idea:
If I wage war at the commandment of my Prince, conceiving the war to be justly undertaken, I do not therefore do unjustly, but rather if I refuse to do it, arrogating to myself the knowledge of what is just and unjust, which pertains only to my Prince.
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From:
Thomas Hobbes (De Cive [1642], 12.II), quoted by Jeff McMahan - Killing in War 2.6
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A reaction:
Hobbes early says that Princes make things just by commanding them. This presumably assumes divine authority in the Prince. This is, of course, ancient pernicious nonsense.
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16977
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If essence is modal and laws are necessary, essentialist knowledge is found by scientists [Tahko]
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Full Idea:
If essence is conceived in terms of modality and the laws of nature are metaphysically necessary, it seems that the laws of nature constitute essentialist knowledge, so the discovery of essences is mostly due to scientists.
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From:
Tuomas E. Tahko (The Epistemology of Essence (draft) [2013], 2.1)
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A reaction:
This seems muddled to me. The idea that the laws themselves are essences is way off target. No one thinks all knowledge of necessities is essentialist. Mumford, for example, doesn't even believe in laws.
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