So at bottom Foucault's enterprise seems stuck on the horns of a huge epistemological dilemma: if it tells the truth, then all knowledge is suspect in its pretense of objectivity; but in that case, how can the theory itself vouch for its truth? It's like the famous paradox about the Cretean Liar—and Foucault seemed quite unable to get out of it (which explains why he didn't even try to face it).
p. 147 - Foucault (1985)