Objective Certainty

Objective certainty is not tied exclusively to conclusive reasons or self-evidence. It may be grounded in the absence of intelligible doubts....

Grounds for doubt are not as easy to come by as skeptics think. Fairy-tale imaginings (e.g. brains-in-vats) don't count.

--Michael Williams, Lecture, "Wittgenstein on Knowledge & Certainty" (video)

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