Departing from Fred Dretske?s groundbreaking article, this essay explore the epistemic closure principle: the principle that states that knowledge is closed under known implication. It also explores the relationship to skepticism, various attempts to challenge and defend the principle, as well as developing a new perspective where the skeptical premise is seen as an a priori justified tautology that can be overriden by a posteriori experience. I argue that Dretske?s illuminating example makes it clear that there is an unescapable choice between either rejecting a skeptical premise ? however intuitive it may seem ? or inextricably having to admit a skeptical conclusion. .