Tom asks,
Does it make sense to say that something could be contingently self-existent? I'm assuming that 'being self-existent' is not the same thing as 'existing necessarily', for then my question wouldn't make sense. Maybe I'm wrong to make this distinction. But if I'm not, can it be a contingent matter that x exists and has self-existence?
The answer depends on what 'self-existent' is taken to mean. If it doesn't mean necessarily existent, then the only other possibility that comes to mind is self-causing. Accordingly, if x is self-existent, then x is not caused by another to exist, but causes itself to exist. This, however, is inconceivable. For a thing cannot do any causing unless it already (logically speaking) exists. Therefore, nothing can cause its own existence. There is no 'existential bootstrapping.' Nothing can haul its (nonexistent) self out of the dreck of nonexistence by its own (nonexistent) bootstraps.
My answer, then, is that nothing is contingently self-existent.
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ADDENDUM (1/11)
After writing the above, I recalled that my late friend Quentin Smith had argued that the universe caused itself to exist, and that I responded in the pages of the British journal Philosophy 75 (2000), pp. 604-612.
ABSTRACT: This article responds to Quentin Smith's, "The Reason the Universe Exists is that it Caused Itself to Exist," Philosophy 74 (1999), 579-586. My rejoinder makes three main points. The first is that Smith's argument for a finitely old, but causally self-explanatory, universe fails from probative overkill: if sound, it also shows that all manner of paltry event-sequences are causally self-explanatory. The second point is that the refutation of Smith's argument extends to Hume's argument for an infinitely old causally self-explanatory universe, as well as to Smith's two 'causal loop' arguments. The problem with all four arguments is their reliance on Hume's principle that to explain the members of a collection is ipso facto to explain the collection. This principle succumbs to counterexamples. The third point is that, even if Hume's principle were true, Smith's argument could not succeed without the aid of a theory of causation according to which causation is production (causation of existence).
My article is here.
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