The world's worst ideas are skepticism, nihilism and statism. You should reject your own good. You are a rightless beast, to be ruled by force. The world's worst ideas turn men into knuckleheads, scolds and thugs. A practicing skeptic is a knucklehead.
Skepticism is the view that no-one can attain certain knowledge of reality.
Whoever swallows skepticism can't help knowing some simple things, but he has no confidence in his judgment. He says neither yes nor no. He suspends judgment, so he just doesn't learn. He's renounced certainty about facts, and that leaves him a sucker for whatever he's told. He may feel he's an intellectual sophisticate, but he's just a knucklehead.