 For those who came after Aureoli, his definition and his notion of esse apparens raised a host of skeptical concerns. If sensation produces an esse apparens, the intellect must also produce a similar object, something Peter Aureoli called esse intentionale. And if intuitive knowledge is a direct knowledge of either the esse apparens or the esse intentionale, and not of the object itself, from where does the certainty come by which one can firmly and confidently state that “this thing exists”? Aureoli’s esse apparens opened up the possibility of an experience, wherein what appears to be present, might actually not be present or even in existence.