http://www.importanceofphilosophy.com/Irrational_Skepticism.html
"We know that we know nothing," they chatter, blanking out the fact that they are claiming knowledge -- "There are no absolutes," they chatter, blanking out the fact that they are uttering an absolute -- "You cannot prove that you exist or that you're conscious," they chatter, blanking out the fact that proof presupposes existence, consciousness and a complex chain of knowledge: the existence of something to know, or a consciousness able to know it, and of a knowledge that has learned to distinguish between such concepts as the proved and the unproved. Ayn Rand, Atlas Shrugged
I think skeptics cannot know anything, locked in circular doubt, certainty is a sin, because your senses cannot be trusted. They are destined to never know.....
The scofftic thinks he knows, but is sadly mistaken.