Agrippan trilemma-style regress arguments, as developed by Sextus Empiricus and revived in Neurath and Quine, show that any foundational metaphysical commitment terminates in brute assertion rather than demonstration.
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Quine(as a proper name referring to the philosopher whose theory is being discussed)
Willard Van Orman Quine was a 20th-century American philosopher who wrote about how we know things and how language works. In this statement, we're discussing one of his specific ideas about observation.
Sextus Empiricus(the source being cited for information about Stoic signs)
An ancient Greek philosopher (around 200 CE) who documented skeptical arguments and different philosophical schools' ideas in his writings.
demonstration(The target of the skeptical critique; assumed to be the standard model of knowledge acquisition)
A method of inferential proof from first principles or definitions, claimed to be the means by which knowledge is acquired
regress argument(moral skepticism)
An argument for moral skepticism that works generally by criticizing each method proposed for ruling out moral nihilism.