Nothingness (n.) is a form of existence.
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Nothingness (n.) is the constitutive structure of the existent.
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Nothingness (n.) is always an elsewhere: one does not find it as one finds a being.
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Nothingness (n.) did not come before existence; it is only an idea in my head, an existence like any other, which appeared after many others — to imagine it you must already be there.
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Nothingness (n.) can never be intuited directly — because nothingness is nothing; it can present itself only as an infrastructure of something. Any attempt to conceive death directly is bound to fail.