A quote from Paul Allen Miller's Truth Telling in Foucault in Parrhesia:

For Kant, Foucault contends, founded a critical philosophy that could go in two directions. It could move toward an analytic of truth,such as that found in Anglo-American philosophy, or toward an ontology of the presentsuch as that found in Hegel, Nietzsche, and the Frankfurt School. Foucault explicitly locates himself in this latter tradition at the beginning of the course. This self-categorization within the tradition of the "ontology of the present" in turn helps to explain the importance of the concept of "habitations of thought" and the centrality of the discourse of truth in relation to instances of power as a form of critique. For the ultimate topic of these lectures is nothing less than how does philosophy become the way in which truth is spoken to power: what does this genealogy tell us about the relation of philosophy to democratic speech, about the constitution of the subject as a speaker of truth, and about the relation of a discourse of truth-telling to specific instances of power?