This paper aims at bringing together the aporetic approach to knowledge in Plato's Theaetetus, with the program of analysis of knowledge in contemporary epistemology. Through this link, it shows the persistence, on the one hand, of Plato's problem in contemporary epistemology, and, on the other, of his aporia. As a result, the paper sheds light from an historical perspective, on the essential features of the epistemological debate in general.