Ellis/Five Principles, 1a. Uncertainty, 'Knowledge', and Sceptical Argument

Scepticism is a practical recognition of uncertainty, which should not be confused with falsehood. Its arguments show formal propositional knowledge to be impossible, because we have no access to truth or complete justification. These arguments are that empirical justification is unreliable, rational justification is subject to infinite regression, and all knowledge claims depend on mistaken disembodied assumptions about meaning.