The infinite regress of doubt. Philosophical skepticism questions the reliability of all knowledge claims—senses, memory, reason. The hard problem is that this doubt must eventually apply to skepticism itself. If you doubt everything, on what foundation do you stand to announce your doubt? The skeptical argument is a tool that, when used universally, saws off the branch it's sitting on. This leads to the paralysis of aporia (a state of perpetual questioning with no answers) or a pragmatic, unprincipled exception where you arbitrarily stop doubting just to function, thereby abandoning the very rigor that defined skepticism.
Example: A radical skeptic says, "I can't trust my senses; I might be a brain in a vat." You ask, "Then how do you know the concept of a 'brain in a vat' is valid? How do you know logic itself is reliable?" They must use their untrustworthy reasoning to justify their doubt about reasoning. The hard problem: Pure skepticism is a mental black hole—it consumes every proposition, including the proposition that propositions should be consumed. To live, the skeptic must quietly assume the world is roughly as it seems, making their skepticism a theatrical performance for intellectual circles, not a livable philosophy. Hard Problem of Skepticism.
by Enkigal January 24, 2026
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